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Old 23-01-2017, 04:10   #1
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Cleaning 3GM30 heat exchanger with radiator cleaner

I remember this advise on one thread of CF to clean all the debries and salt which maybe inside,to reduce pressure on the pump.
I feel,that in my case at least one - port motor,may require such exersise:
- I have to tighten the belt every 2-nd day , using the motor and
- have to change it after 25-30 hours work.
Starboard motor is a bit better. So, my questions:
1). Is it worth to do ?
2). How to do ? Just connect the water strainer pipe to a bin with the cleaning solution and lead the exhaust pipe to the same bin ?
For how long should I run the motor ?
I have asked the local Yanmar mecano to do this,but their bomberos are always busy on something else. He also advise not to tighten too much the water pump belt.
I have a fresh water( coolant) type Yanmar 3GM30FC
I know,the best way is not to use motors - just sails...But, this stabborn belt always hits me on maneuvers - running normal at 2500 rpm, when drop to idle,or about 1000 - gives me a high temperature zoom.
Appreciate any help
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Old 23-01-2017, 05:56   #2
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Re: cleaning 3GM30 heat exchanger with radiator cleaner

All the usual suspects, just for starters;

Pulley misalignment and/or bent mounting bracket.

Worn out water pump">raw water pump, not allowing full output (overheating at idle).

Clogged exhaust elbow.

Pieces of old impeller trapped in cooling system.

Blocked or obstructed intake or collapsed hose.


I'll let someone with more experience with chemicals advise the best method for a 'liquid fix'.

Personally, I've had better luck with the 'mechanical method'; disassembling the cooling parts and cleaning with brushes or other appropriate tools...if this is possible in your application.
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Old 23-01-2017, 06:04   #3
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Re: cleaning 3GM30 heat exchanger with radiator cleaner

jimbunyard:
Worn out raw water pump, not allowing full output (overheating at idle)
- it overheats only when the belt is stretched. When I put new one it works perfect on idle
Will try to check allignment - thanks for advise. Visually it's alligned
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Old 23-01-2017, 06:55   #4
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Re: cleaning 3GM30 heat exchanger with radiator cleaner

I have kept two GM series Yanmar engines going just by replacing exhaust elbows (4 or 5 year intervals), and mechanically cleaning the heat exchanger tubes in place. Pull the front cover and take a look. If you have ever eaten a impeller this is the likely home. The heat exchanger is 3 pass setup. If things are not too fouled I don't even remove the aft cap. Use a brass rifle cleaning brush with extension and a portable electric hand drill motor. Some small stuff will end up in the back cover but expect that it will all get washed out on startup.

My pump belts last for years and I usually snug them up once a year.

I am currently 2+ years into a 316 SS exhaust elbow from ebay. Only time will tell, but not much more than standard Yanmar.
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Old 23-01-2017, 07:10   #5
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Re: cleaning 3GM30 heat exchanger with radiator cleaner

Frankly,got it! No chemicals. Hands,drill and rifle brush. Will follow it
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Old 23-01-2017, 12:50   #6
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

Does the old Yanmar 3GMD have Anodes on the engine, if so how many?

Cheers Jeff.
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Old 23-01-2017, 13:06   #7
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Re: cleaning 3GM30 heat exchanger with radiator cleaner

Quote:
Originally Posted by Frankly View Post
I have kept two GM series Yanmar engines going just by replacing exhaust elbows (4 or 5 year intervals), and mechanically cleaning the heat exchanger tubes in place. Pull the front cover and take a look. If you have ever eaten a impeller this is the likely home. The heat exchanger is 3 pass setup. If things are not too fouled I don't even remove the aft cap. Use a brass rifle cleaning brush with extension and a portable electric hand drill motor. Some small stuff will end up in the back cover but expect that it will all get washed out on startup.

My pump belts last for years and I usually snug them up once a year.

I am currently 2+ years into a 316 SS exhaust elbow from ebay. Only time will tell, but not much more than standard Yanmar.
Frankly, could you please provide details and perhaps a link to the SS exhaust elbow? I take it it's not a Yanmar part. I'm about to change mine and the price for the little bugger in Brazil makes my eyes water!
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Old 23-01-2017, 13:14   #8
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

Quote:
Originally Posted by Boxertwinjeff View Post
Does the old Yanmar 3GMD have Anodes on the engine, if so how many?

Cheers Jeff.
they have anod inside. Changed this year...was like new. But,it require to dismantle half the motor
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Old 23-01-2017, 13:35   #9
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

This is the one for the GM series. It was a high quality casting and fit without issues. I will have to take their word on the 316 SS but it is non magnetic.

Stainless Steel Exhaust Mixing Elbow Replaces Yanmar GM 124070-13520 | eBay

If this is not the correct unit do a search on "Yanmar exhaust elbow", bunch listed.
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Old 24-01-2017, 00:05   #10
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

Most likely problem is rust/pitting on the pulleys. If the pulley has gone rusty in the past it will leave corrosion pitting on the pulley face, this will wear out the belt very quickly.
On my 3GM30 both the crankshaft pulley and the pump pulley were badly corroded through lack of use (before my ownership)....the pump pulley I removed and re-machined the belt faces on my lathe, the crankshaft pulley I polished with 180 grit Wet & Dry with the engine running, holding the W&D in long nose pliers.....quite dangerous, be careful!
The best way for you will be to remove the pump pulley and replace it, and remove the crank pulley and have it machined, or polish it yourself.
Good luck.
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Old 24-01-2017, 01:52   #11
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

Sputnik:"Most likely problem is rust/pitting on the pulleys."
- Thks for advise, Neil. Mine aren't rusted,therefore maybe not perfectly round and smothe. I'll go for your advise. Polishing the shaft puley:
"the crankshaft pulley I polished with 180 grit Wet & Dry with the engine running, holding the W&D in long nose pliers.....quite dangerous, be careful
"
- did you hold the pliers with a grid within the belt limits ? Means, the pump was running to ?
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Old 24-01-2017, 10:39   #12
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

How big is the alternator you run on the engine with the belt problem? Are there belt alignment issues?

Personally I've never seen a water circulation pump cause a belt to fail, but this could be a first time I suppose.
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Old 24-01-2017, 16:37   #13
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

The GM seawater pump has two ball bearings carrying shaft loads. If the seal has failed and these bearings are getting wet they probably would add a lot of load to the belt. Usually when the seal fails there will be some water drips from the area behind/in front of the seal.
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Old 24-01-2017, 17:28   #14
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

Yes it's true the GM series engines have a separate belt driven raw water pump, but was the person with belt problems having issues with the raw water pump belt or the coolant circulation pump belt?
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Old 24-01-2017, 18:16   #15
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Re: Cleaning 3GM30 heat exchanger with radiator cleaner

I also had a raw water pump slippage problem, with a genuine brand-new Yanmar belt slipping on my 2GM.
I bought the next size down from a generic belt supplier (at about 1/3 Yanmar price I might add!) and it works fine. I kept the OEM belt as a get-me-home spare.


Previously, I could not get rid of the black dust from slippage no matter how often I tightened it - it was just a fraction too big, whereas the new one snugs up nicely and stays that way.


btw, corrosion on the pulley would most likely add to the friction and reduce any slippage, but the abrasion would wear the belt much more quickly.


Cheers, Graeme
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