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Old 19-11-2015, 14:22   #91
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Re: 2GM Yanmar Oil in Exhaust

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Originally Posted by Ocean Diamond 2 View Post
Hey Brian,

I had a Dehler that went through 2 2gm20 Yanmars and 2 3gm30's so I have some experience and I'm local.

You should try Minards Diesel service, the local Yanmar agent. They helped me a lot.

When you get it fixed can I come for a ride as I've never been on a Contesa 25 and would love to experience 9 knots

Good luck mate,
Derek
That's a decent offer!
And good to see another plug for Minnards (see post #59 ). For the OP, I can't emphasize enough how helpful Minnards can be.

@ Dererk, there must be a good story behind all those GMs - but not for this thread, we have the 9 kt issue to sort though once the engine is sorted
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Old 19-11-2015, 21:41   #92
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Re: 2GM Yanmar Oil in Exhaust

Minards haven't been helpful as I got the rookie James out a year ago and he told me the black smoke was a problem w the head and told me $ 2k to recondition the head. I solved the problem myself by adjusting the valve that had no clearance, and the engine ran great after that ( until now, but different issue now). Perhaps the head mechanic is great there, but all I have seen is overpriced parts and lack of knowledge, hence the reason I would rather ask here for advice !

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Old 19-11-2015, 22:20   #93
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Re: 2GM Yanmar Oil in Exhaust

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Originally Posted by miabellabrian View Post
Minards haven't been helpful as I got the rookie James out a year ago and he told me the black smoke was a problem w the head and told me $ 2k to recondition the head. I solved the problem myself by adjusting the valve that had no clearance, and the engine ran great after that ( until now, but different issue now). Perhaps the head mechanic is great there, but all I have seen is overpriced parts and lack of knowledge, hence the reason I would rather ask here for advice !

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Hi Brian,
I'm sorry you had some problems with them but too their credit I've always been treated really well and thought of them as good at their jobs.
I had a 2gm20 pump out all the oil on a trip and the engine alarm failed to work after the marine electrician had a go at it, thats when my fun started.
I think I'm hearing that you dont want to waste money on the old Yanmar, so you could try either electric and a couple of solar panels on a arch off the back or maybe go up to the top end of the lake and get a Volvo off the endeavour marine mob?
Please let us know your thoughts.
Remember I'm not too far away so if you need a hand just holler.
Derek
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Old 19-11-2015, 22:28   #94
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Re: 2GM Yanmar Oil in Exhaust

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That's a decent offer!
And good to see another plug for Minnards (see post #59 ). For the OP, I can't emphasize enough how helpful Minnards can be.

@ Dererk, there must be a good story behind all those GMs - but not for this thread, we have the 9 kt issue to sort though once the engine is sorted
Hi Wotname,
Yeh great tale and all in a Van De Stat design boat , to boot.
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Old 19-11-2015, 23:11   #95
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Re: 2GM Yanmar Oil in Exhaust

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Originally Posted by miabellabrian View Post
Minards haven't been helpful as I got the rookie James out a year ago and he told me the black smoke was a problem w the head and told me $ 2k to recondition the head. I solved the problem myself by adjusting the valve that had no clearance, and the engine ran great after that ( until now, but different issue now). Perhaps the head mechanic is great there, but all I have seen is overpriced parts and lack of knowledge, hence the reason I would rather ask here for advice !

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Not 2K to recondition a Yanmar 2 cyl head. I took my 2GM 20 head off and. I bought a new set of valves and seals from the Yanmar agents and took it all to a cylinder head specialist. He planed the head cut the valve seats tested the valve springs and reassembled the new valves in the head. He has all the specialised equipment and didn't have to do any running around. From memory his work was $300 and the valves etc were around $150. I might be a little out but not much.

If you were to get a Yanmar mechanic to do the job you would pay traveling time for them to come to your boat. You would pay for them to undo some bolts, and then they would send the head to a specialist by courier (like my specialist). The Yanmar mechanics don't do the machining themselves. It would be couriered back to the Yanmar mechanic and they would put 25% to 50% mark up on the specialists charge. Then they would come to your boat and charge traveling times and labour time to bolt it back in. The mechanic might have a lunch break on the way to your boat and you would pay for that. It might all come to $2K

My cylinder head specialist is not a diesel specialist. He does heads for cars and modifications etc. There is nothing different about a Yanmar head and he actually had a single cyl Yanmar head in there before mine. An engine reconditioning machine shop should also have the head machining equipment but you ask if they send it out or do it themselves.

There is a tremendous amount you can do yourself to save a lot of money if you know how the system works and do some running around.

However, if you recondition a cylinder head and put it on a motor that may be a bit worn in the bottom end, you may accelerate those problems.
It will run better but not for as long because the extra, as new, compression could strain the old bearings. You know old the story about new wine in old bottles that can break and you lose the wine.

It might be better to simply do a gasket change and a head flatness check. You can do that yourself with a straight edge on edge and a feeler gauge. However if you decide to plane that head it will need to be stripped and the compression will have been increased due to the amount removed. So it will put more strain on the bearings.............

I would suggest you might be best to just do a head gasket change unless you want to do the whole engine.

And check that prop. I think your motor takes the tachometer signal from the alternator. That system can be quite inaccurate. (I had one on an earlier motor)
You can get ( borrow) a hand held one that pushes onto the crankshaft pulley or one that uses a strobe light; to check yours and make a correction table.
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Old 20-11-2015, 05:14   #96
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Re: 2GM Yanmar Oil in Exhaust

Sound good, anyone have a idea on the cost of rebuilding a 2gm ? I can do a few things to try to save some money, but would leave some of the technical things for the experts


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Old 20-11-2015, 10:03   #97
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Re: 2GM Yanmar Oil in Exhaust

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Originally Posted by miabellabrian View Post
Sound good, anyone have a idea on the cost of rebuilding a 2gm ? I can do a few things to try to save some money, but would leave some of the technical things for the experts


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The last 4 cyl head rebuild I had done was less than $600. Find a good small shop. If by "rebuild" you just mean the lower end and head, do the same thing, find a small shop with a good reputation. Simple little engine. I think it's common practice on the GM series to buy the pistons/rods pre assembled IIRC. The engine runs good so just leave your Injector pump etc alone. once you get all the peripherals off the engine you and one other should be able to lift the basic block out of the boat I think...?
But maybe you should bite the bullet and remove the head and see what you find.
It sure would be nice to get a compression test, but get the head rebuilt and try the oil leak down test SailorChic mentioned.
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Old 20-11-2015, 14:02   #98
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Re: 2GM Yanmar Oil in Exhaust

Quote:
Originally Posted by miabellabrian View Post
Minards haven't been helpful as I got the rookie James out a year ago and he told me the black smoke was a problem w the head and told me $ 2k to recondition the head. I solved the problem myself by adjusting the valve that had no clearance, and the engine ran great after that ( until now, but different issue now). Perhaps the head mechanic is great there, but all I have seen is overpriced parts and lack of knowledge, hence the reason I would rather ask here for advice !

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I'm sorry to hear about your bad experience with Minnards, it does sound like they "blotted their copybook" in your case.

I've only ever dealt with them from afar and maybe they don't let the rookies do the phone calls . Always got good advice and speedy dispatch of parts and so on. Try a phone call to the boss and see what eventuates; you don't have to buy if you are not comfortable with the advice or pricing!

Graham HO's advice seems spot on to me.

It also sounds like you could "repair" the engine rather than "rebuild" it and that may be as simple as new head gasket!!!

I reckon you have two options right now.

1. whip the head off yourself, visually inspect and do SailorsC "ring test"

or

2. Compression test / leak down down test.

The first is cheaper, easy but takes longer; the second is more informative and presumably costs more.
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Old 20-11-2015, 14:04   #99
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Re: 2GM Yanmar Oil in Exhaust

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The last 4 cyl head rebuild I had done was less than $600. Find a good small shop. If by "rebuild" you just mean the lower end and head, do the same thing, find a small shop with a good reputation. Simple little engine. I think it's common practice on the GM series to buy the pistons/rods pre assembled IIRC. The engine runs good so just leave your Injector pump etc alone. once you get all the peripherals off the engine you and one other should be able to lift the basic block out of the boat I think...?
But maybe you should bite the bullet and remove the head and see what you find.
It sure would be nice to get a compression test, but get the head rebuilt and try the oil leak down test SailorChic mentioned.
If the cylinders need reboring the injector pump will need to be removed. Then of course it will need to be properly re-timed on reassembly. A 30 year old Yanmar will likely need reboring. They can go +60 thou" with max oversize pistons.
The whole rebuild job, including bearings, professionally done is around half the cost of a new similar but better Yanmar. (using the original gearbox) That is excluding removing, transporting and reinstalling the engine, which is easily done, and I did single handed with my yacht in the marina berth a couple of years ago.

Then either a new or rebuilt engine should go another 20 / 30 years. But the new engine will be able to be rebuilt again, and the rebuild may not.

But we are not sure whether his engine needs rebuilding. If it starts OK, and doesn't have any mechanical rattles, I'd live with it, and do a head gasket change. Even a cylinder leak test is not worth doing unless he is prepared to follow up with an overhaul if necessary. I've used bulk WD40 for that but diesel or any oil will do. And naturally followed by an oil change.

For use in Lake Macquarie, not going out to the ocean, he can't get into much trouble, if he can sail and anchor. The engine won't need to be in pristine condition.
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Old 20-11-2015, 14:04   #100
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Re: 2GM Yanmar Oil in Exhaust

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...
But maybe you should bite the bullet and remove the head and see what you find.
It sure would be nice to get a compression test, but get the head rebuilt and try the oil leak down test SailorChic mentioned.
Yep, +1
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Old 20-11-2015, 15:31   #101
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Re: 2GM Yanmar Oil in Exhaust

If you start pulling apart an old engine and "cleaning" everything, you risk breaking the carbon seals that have built up over time and the motor may run worse. Some bits should be cleaned such as the exhaust bend.

A simple head gasket change without doing anything else is a good idea initially, and can't do any harm. That'll cost: Gasket $100, Torque wrench and some sockets $100. The wrench will be handy again in the future or could be sold off. Don't forget some gasket goo or waterproof grease on both sides of the gasket. I prefer grease. Some people use nothing but I'm old fashioned. Of course clean the mating surfaces of the block and head. It'll all take less than a couple of hours and could be done in 30 minutes. Finally adjust the valve clearances to +8 thou". You won't even need to do an oil change unless it's due. Then see how it goes. Pencil it in for next weekend. Meanwhile you can find the correct torque settings and look up the tightening sequence which you reverse for loosening.
Then it will be a new skill learned.
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Old 20-11-2015, 15:44   #102
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Re: 2GM Yanmar Oil in Exhaust

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Yes as I said a couple of posts back, you should loosen in the correct order but I think tightening in the correct order is even MORE important as it allows the gasket to settle in "flatly".
I didn't say it is not important to loosen in the correct order and I always do that.
I just knew somebody make that comment.( I did make a typo writing "a" instead of "as" but my meaning should have been clear)
If we check spelling or grammar , I'd be in front of the line for errors.
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Old 20-11-2015, 16:36   #103
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Re: 2GM Yanmar Oil in Exhaust

PS, you will also need a new gasket and exhaust goo for the exhaust bend as you should check it for carbon build up and corrosion. They last about 4 years and cost $150? You may not need to remove the exhaust hose but you will need to disconnect the water hose. There is an oil line behind the head which will need disconnecting at that end. Initially lift the head after removing retaining nuts / bolts by hand cranking using the engine compression. Keep clear in case it fires up for a moment. ( unlikely). Then disconnect the injector fuel lines and if you don't turn the engine again you probably won't need to bleed the lines after reassembly. Valve clearances +8 thou".
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Old 20-11-2015, 18:39   #104
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Re: 2GM Yanmar Oil in Exhaust

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If we check spelling or grammar , I'd be in front of the line for errors.
If you had to checked the previous posts you would have understood.
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Old 01-12-2015, 06:19   #105
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Re: 2GM Yanmar Oil in Exhaust

OK looks like blown rings and the head is in bad condition too.
Does anyone know if the 2gm gearbox will fit on a 2gm20 engine, by putting on the bell housing???

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