Yet another 1GM10 question

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RTB

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My engine fires OK but unfortunately spits out fuel with the exhaust fumes. I've done all the maintenance jobs (which I should have done earlier), even replaced part of the exhaust tube, but don't know what to do next. Oil & filters all replaced, even renewed one of the silencer boxes. Any suggestions please?
 
RTB said:
My engine fires OK but unfortunately spits out fuel with the exhaust fumes. I've done all the maintenance jobs (which I should have done earlier), even replaced part of the exhaust tube, but don't know what to do next. Oil & filters all replaced, even renewed one of the silencer boxes. Any suggestions please?
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Take the injector to a specialist and have it rebuilt. There will probably be someone local to you - if not McAlister Fuel Injection in Cumbernauld will do it by post, and they made a cracking job of my 1GM10 injector for 35 quid or so. If that doesn't work it might be worth checking the precombustion chamber. The parts are fairly cheap, for Yanmar, but you will probably have to take the head off and a Yanmar gasket is £60 ...

Injector first, though.
 
Unburnt fuel will give black exhaust smoke. If it's a trail of pretty rainbow colours you are seeing on the water behind you that's the engine oil being ejected due to a rusted out cylinderhead caused by an internal failure of the exhaust elbow.
 
RTB said:
OK thanks I will do the injectors although that's a job I've been afraid of!
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It's a doddle. Takes five minutes to get it out (fuel line off, retaining bolts undone, pull) and not much longer to get it in again. If you do end up needing a new head, try to find someone who'll bring you one from the US, where they cost half what they do here.
 
nathanglasgow said:
Unburnt fuel will give black exhaust smoke. If it's a trail of pretty rainbow colours you are seeing on the water behind you that's the engine oil being ejected due to a rusted out cylinderhead caused by an internal failure of the exhaust elbow.
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When black smoke is mentioned, is it actual smoke or just black substance in the cooling water.
 
Hope it's not a new head your going to need. Just checked the receipts for parts when we did this to our last boat (halcyon 27) and they came to just shy of £700. New head,exhaust elbow,all gaskets and new injector seals/precombustion chamber seals. We did all the work ourselves and if you are used to a bit of spannering it's dead easy,infant probably the easiest head replacement I have ever done. Took maybe an hour so if you're paying someone don't let it be too much.
 
nathanglasgow said:
Hope it's not a new head your going to need. Just checked the receipts for parts when we did this to our last boat (halcyon 27) and they came to just shy of £700. New head,exhaust elbow,all gaskets and new injector seals/precombustion chamber seals. We did all the work ourselves and if you are used to a bit of spannering it's dead easy,infant probably the easiest head replacement I have ever done. Took maybe an hour so if you're paying someone don't let it be too much.
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I agree - it's a pretty straightforward job. I did it two years (I think) ago. All the parts came from America and cost £390, of which £300 was the head ... at that time they were £471 in the UK and I believe they are now £600. The only awkwardness is getting the gasket the right way up ... the manual tells you that one side says "Top" but they don't, any more.

Edit: As well as the stuff you mention I also changed the precombustion chamber and the thermostat.
 
A chum at the Forth Cruising club in Limekilns got his head welded somewhere over on the west coast following the usual salt water back flow into the exhaust port problem following a corroded elbow.

In my own case, while doing a top end overhaul, the injector had to be pressed out. This included the pre-combustion chamber which was broken in the process. I had the pump and injector done as a package in Fareham for £80.00. i always think it's best to send both for a service then they can be calibrated.
 
I've unfortunately missed your post where you determined the engine is spilling fuel, while operating correctly. Are we correct to assume an actual oil slick at your transom? Also, Does this mean you've traced the fuel return line from the injector to the tank and determined it's not leaking?
 
Tropic Cat said:
I've unfortunately missed your post where you determined the engine is spilling fuel, while operating correctly. Are we correct to assume an actual oil slick at your transom? Also, Does this mean you've traced the fuel return line from the injector to the tank and determined it's not leaking?
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Yes there is no visible leak but there is a constant "oil" slick from the transom.
 
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