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Old 15-05-2015, 06:09   #1
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Yanmar 3HM35

Hey folks, have a question.....have an old 3HM35 Yanmar that hasn't missed a beat for years . When i purchased the old girl she hadn't been out of the marina in 7 years but after due service and care she fired up first time.
She recently underwent a minor refit and over haul .
On arriving at our new mooring a 2-3 hour motor (no wind on the day). On arriving noticed a small hole in the exhaust manifold. After attempts at repair . We decided on a new manifold.
Everthing went gr8 perfect. Until we went to fire her up and she has seized. We've tried manual cranking but won't budge. Damn.
Any advice . We've heard eucalyptus oil, CRC, Kero. Any advice?
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Old 15-05-2015, 06:10   #2
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Re: Yanmar 3HM35

Greetings and welcome aboard the CF, Bris4fun.
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Old 15-05-2015, 06:18   #3
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Re: Yanmar 3HM35

Hydrolock maybe???
Have you tried turning it over with the decompression levers operated or taken out the injectors?
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Old 15-05-2015, 06:24   #4
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Re: Yanmar 3HM35

Uh oh, sounds like the hole in the manifold (or something else that occurred during the repair) may have allowed cooling water to back into one or more of the cylinders (hydro lock). Check out the many posts on hydro lock recovery here and elsewhere on the internet. Basically you need to get the water out of the cylinder(s) and oil ASAP and hope nothing was damaged when the engine stopped.
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Old 15-05-2015, 08:29   #5
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Re: Yanmar 3HM35

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Originally Posted by Wotname View Post
Hydrolock maybe???
Have you tried turning it over with the decompression levers operated or taken out the injectors?
Yes tried that
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Old 15-05-2015, 08:31   #6
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Re: Yanmar 3HM35

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Originally Posted by jkishel View Post
Uh oh, sounds like the hole in the manifold (or something else that occurred during the repair) may have allowed cooling water to back into one or more of the cylinders (hydro lock). Check out the many posts on hydro lock recovery here and elsewhere on the internet. Basically you need to get the water out of the cylinder(s) and oil ASAP and hope nothing was damaged when the engine stopped.
Thanks for that will try that.....It didn't actually stop or seize ....just didn't start again. After replacing the manifold
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Old 15-05-2015, 09:15   #7
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Re: Yanmar 3HM35

If it didn't hydrolock at speed you may be in luck. You need to determine what is preventing it from turning over by hand. Remove the glow plugs. If the engine turns over and water spurts out of one or more of the cylinders, it was hydrolocked. If it still doesn't turn over you have other issues.
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Old 15-05-2015, 16:53   #8
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Re: Yanmar 3HM35

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Originally Posted by Bris4fun View Post
Thanks for that will try that.....It didn't actually stop or seize ....just didn't start again. After replacing the manifold
First - Welcome aboard and with that username, presumably you are a banana bender

OK, now about your engine problem. I'm a little confused, the orginial post states the engine was seized and wouldn't budge, even manually. This sent us all of down the hydro lock line...

Now it seems that the engine isn't seized, rather it won't start after replacing the manifold.

So lets look at the failure to start issue.

First:

1. Does the electric starter motor operate normally and spin the motor over easily but the engine fails to fire up and run

OR

2. does the electric starter motor fail to turn the engine over at all.

The answer to this is critical in deciding which fault finding path to follow next.

If 1, then you probably have a fuel supply issue like no fuel, dirty fuel supply, crud blocking the fuel line, air in the fuel line or air being sucked into the fuel supply etc.

BUT

if 2, then you probably have an electrical issue in the starter motor circuit like flat battery, corroded terminals, failed ground return wire, dodgy solenoid, faulty start switch, dodgy connectors in engine harness, worn out starter motor and so on.

Either scenarios could possibly be caused when replacing the manifold or doing the minor servicing a few days earlier. By the way, did you carry out either of these tasks or have someone else do them? What was the nature of the minor service?
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Old 15-05-2015, 18:00   #9
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Re: Yanmar 3HM35

Quote:
Now it seems that the engine isn't seized, rather it won't start after replacing the manifold.
Where did you get that from?

OP, you will probably have to pull the head to see what is wrong. One member here could not turn his engine over, although he could turn it back and forth some number of degrees, because of a small amount of carbon sitting on top of one piston. Could be something got dislodged when you were working on the manifold. One thing of interest is the time frame that this all took place in.
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Old 15-05-2015, 18:08   #10
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Re: Yanmar 3HM35

Quote:
Originally Posted by Bris4fun View Post
Hey folks, have a question.....have an old 3HM35 Yanmar that hasn't missed a beat for years . When i purchased the old girl she hadn't been out of the marina in 7 years but after due service and care she fired up first time.
She recently underwent a minor refit and over haul .
On arriving at our new mooring a 2-3 hour motor (no wind on the day). On arriving noticed a small hole in the exhaust manifold. After attempts at repair . We decided on a new manifold.
Everthing went gr8 perfect. Until we went to fire her up and she has seized. We've tried manual cranking but won't budge. Damn.
Any advice . We've heard eucalyptus oil, CRC, Kero. Any advice?
He says it has seized and won't budge manually.
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Old 15-05-2015, 18:57   #11
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Re: Yanmar 3HM35

Quote:
Originally Posted by Bris4fun View Post
Thanks for that will try that.....It didn't actually stop or seize ....just didn't start again. After replacing the manifold
Quote:
Originally Posted by jkishel View Post
He says it has seized and won't budge manually.
He also says it isn't seized...
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Old 15-05-2015, 22:30   #12
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Re: Yanmar 3HM35

Yeah, maybe I'm wrong but I took his meaning to be that it didn't seize up when it was running but after it was shut down.
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Old 15-05-2015, 23:33   #13
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Re: Yanmar 3HM35

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Originally Posted by DeepFrz View Post
Yeah, maybe I'm wrong but I took his meaning to be that it didn't seize up when it was running but after it was shut down.
Fair call

I now take his meaning to be it doesn't turn over after it was shut down like the starter motor doesn't work or similar.

Hopefully he will clarify the real problem when next he pops back on line thus allowing us to direct the help towards the real issue and put us out of our collective misery
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Old 16-05-2015, 05:55   #14
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Re: Yanmar 3HM35

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Fair call

I now take his meaning to be it doesn't turn over after it was shut down like the starter motor doesn't work or similar.

Hopefully he will clarify the real problem when next he pops back on line thus allowing us to direct the help towards the real issue and put us out of our collective misery
Sorry guys , didn't mean to create a problem. The engine was running fine when we moored her. We noticed a small whole in the manifold after we had turned the engine off, so we removed the manifold , had a new one made and fitted the new one.
It was then when we tried to start her the starter motor would not turn over at all . We cleaned the terminals, recharged the batteries. Looked for any electrical faults and could not find any. The starter is getting power so it apears or we summized the engine some how had got salt air or water in the cylinder and had surface rust or such. We then tried to turn the crank with a breaker bar , just to free her up, but to no avail. We the tried putting CRC in the bore after removing the injectors. We left it a few days to soak in and tried to manually turn her over with the breaker bar but still won't budge.
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Old 16-05-2015, 06:17   #15
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Re: Yanmar 3HM35

I've got two of those in our boat. Very interested in your findings on cause of this. How long did the engine sit idle after you last shut it down to repair the manifold?

Did you change anything else other than the new manifold?
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