I have used these for my 2GM, no problems so far:
That sounds interesting. I am not sure yet, but I maybe be in the market for an entire heat exchanger/exhaust manifold.I have just removed my 4JH4E and replaced with a 4JH5E. Haven't decided yet wether to sell off parts or as a running engine. Anything particular I can help with?
Plan is to head off on extended cruise next June. (Possibly retire.) So boat is now being refreshed here where it is much easier. There are a few things left to do but all low cost. i.e. woodwork.That sounds interesting. I am not sure yet, but I maybe be in the market for an entire heat exchanger/exhaust manifold.
But why are you changing the engine? The 4JH4E is not that old?
That's the same age as mine. I week ago I would have said the 4JH4E had another 30 years of life but the corrosion I have found in the heat exchanger on mine is changing my mind. I did think it odd that there are no anodes in the engine.The old engine is about 8 years old.
Part of me thinks I should stick it on Boats and Outboards for around £1k just to shift it. However, some of the parts are new as not needed for my set up. i.e. Alternator, Mixing Elbow. I also converted the engine to use serpentine belts last year. May be I should put it back to a V belt and sell on the serpentine kit.
Yea! Looks a lot like mine. Clearly poor design. An aluminium casting with mild steel bolts holding a brass end-cap onto a copper matrix. No wonder the aluminium casting ends up as an anode, water leaks into bolt holes, bolts corrode in place, trying to remove them shears one off. I've just been there. No wonder too that Yanmar only sell the whole unit, fresh for further electrolytic destruction. I think I would/will be looking for a different manufacturer if I have to replace this 8 year old engine.Have a look at the heat exchanger issue here and the price for a new one.
That's what I'm hoping to get done. The Yanmar guy is due tomorrow to look.If it's any consolation I wouldn't replace the heat exchanger. I would take the unit off and have the end schemed. Yanmar use too thin an olive that sits in a recess. With the end skimmed down as far as the bottom of the recess and the bolts drilled out repair the threads with a Helicoil or similar. Make new gaskets out of silicon sheet.