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Old 16 September 2012, 12:01   #41
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Country: Netherlands
Town: Goudswaard
Boat name: mr D
Make: Deltapower
Length: 6m +
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My money is on fuel timing as doggypaddle suggested - do you have a long history on the engine? It was rather recently overhauled? Is there a chance somebody tried to improve performance on the jet maybe?

I had a yanmar 4lh on a HJ which smoked like a panicking Sioux Chief during battle. this turned out to be partly because the engine had been tweaked to work optimal (in somebodies opinion at least) with the jet (higher revs) and we solved the grey smoke part on that engine by tweaking back the timing on the fuelpump. So if somebody tweaked yours for the same reason ... It may give some direction on where things are wrong(actually yanmar allowed higher revs on this engine when coupled to a jet than to a propeller, at least so they told me when adressing some other jet/ engine issues).
If it is not that or injectors i have some fears you may end up with some disassembly work this winter!
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Old 16 September 2012, 13:24   #42
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Country: UK - England
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Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
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Just the propshaft bolts and mounts to undo and then the search begins for something that is tall enough to lift the engine out, with the Rib on its trailer. I don't think the forktruck (Eager Beaver)will lift high enough. Will find out tomorrow. I am happy that I have made the decision to go this route, at least I can sort out the odd oil leak whilst it is out and give the engine a paint up, as well as clean all the gunge out of the bilges and give the engine bay a spruce up. I will have all the intercoolers and heat exchangers checked whilst it is out, I don't want to be doing all this lot again. As I have been going round it, I have noticed lots of little jobs that needed doing that were a real pain to get at, with the engine in place.
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Old 17 September 2012, 13:56   #43
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Country: UK - England
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Engine is out and sitting on its high tech engine stand. So much easier to work on!
Found some other odds and sods that need attention, now that I can get to everything. Plan is to do the repairs and get it running properly on the stand before putting it back in the boat. looking at the pump, it appears to be fully retarded on its slots, so chances are that the pump timing is out.
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Old 18 September 2012, 13:20   #44
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Discovered the cause of a driveline vibration that had been perplexing me today, took the propshaft off and found the large nut that holds the flange onto the jet drive was loose.
Hopefully the mainshaft hasn't been to badly mauled, wont know until I get it out tomorrow. The previous owner had all this apart to have the impeller overhauled, so obviously didn't tighten it properly. Wonder what else I am going to find?
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Old 22 September 2012, 13:31   #45
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Stripped the head out today. After giving all the valves a couple of laps with fine paste, surprised to see such bad pitting on both inlet as well as exhaust valves. Not much carbon build up and the guides are all good, as are the valves. The inserts in the head don't look particularly well done, with quite a large lip protruding in the middle of the chamber beside the injector hole. No 1 exhaust has quite a large chunk missing from the inner face of the seat (first pic) . interesting to see what has caused this, the fact that there was no air cleaner, other than a bellmouth with a bit of mesh across it, wont have helped. Any sand that got into the engine box, will have got sucked straight in. I think I might have a new set of inserts fitted and blended in to remove the sharp edges.
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Old 28 September 2012, 08:33   #46
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Country: UK - Wales
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propshaft falling off, dodgy valve seats....I think I would whip the pistons out as well, measure/hone the bores while you have the chance in-case that was "overlooked" too
also a good opportunity to replace the big end shells if they show any wear and also all the Rod bolts, last thing you want if its running right is to find a leg out of bed for the sake of a set of rod bolts They should be cheap i guess Ford D series/Cargo 08-14 ones the same?
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Old 29 September 2012, 13:08   #47
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Country: UK - England
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Boat name: Fugly & Rokraider 1
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I have come to the same conclusion. If everything is good then the worse case would be a set of shells, seals,conrod bolts, rings and a light hone. It had good oil pressure before, so am not expecting to find any issues with the bottom end.

I am also going to put some timing marks on the front crank pulley that are clearly visible, so when it is back in the bilges, if I want to check the timing, it will be much easier.


Temptation is to upgrade the bores and liners to the later Cargo turbo spec, which would raise the compression some. Problem is I am not sure how well they will cope cranked up to 250 BHP.
I need to do some more homework before going much further.
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Old 29 September 2012, 13:21   #48
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Is there a cold start lever on the pump that's not adjusted right or not tripping back proper .
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Old 29 September 2012, 16:34   #49
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It does have a push knob on the side of the pump for cold starting, but that appears to be working properly and pops in and out ok. I never use it. The pump is being given an overhaul anyway and I have asked for a list of faults found.
I am considering fitting a heater system on the intake manifold to help with cold starting whilst it is all accessible. The Mazda 3.5 turbo diesel (which is based on a Perkins) has a very neat heater element that fits into the mouth of the intake manifold and is very efficient.
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Old 30 September 2012, 13:38   #50
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Pistons out. Bores look good as do the pistons. Going to take the block and pistons in for a light hone and measure before re asembling with some new parts. Signs of oil contamination in the shells, but the crank looks ok at this point. Wont know for sure until i get it out. Now need to make a puller to get the crank pulley off.
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