DIY Overhaul

[markpj23]

OK - I'm an admitted newbie with good mechanical skills. Have rebuilt gas engines in the past... BUT..

Evaluating purchase of a boat with >4,400hrs on a Yanmar 4TH2DTE. Condition of the boat does NOT suggest maintenance schedules were strictly adhered to.. (understatement).

Is it feasible to undertake a rebuild as a DIY project? I know I'll need to send out the injectors and the normal machine shop items, but am I being too naiive here?

[Alan Wheeler]

Not at all. A Deisel engine is just as easy as a Petrol (Gas) engine, with the obviouse differences in ignition of course. The main area you will note, is weight of components being heavier and torque ratings higher. I suggest you remove the engine compleatly if you can and then have the benifit of a good all round working environment.
The main area of concern on re-assembly, is getting the injector pump timed correctly. Make sure it's timing postion is marked in such away, that the mark can not be removed. Take plenty of photo's and remember, if you do have a bolt or two left over at the end of assembly, DON'T drop it in the engine and hope it will find it's way home

[never monday]

Some things of note on Yanmar.
The number 1 cylinder is at the flywheel, exactly backwards for everything you've ever learned.
The injector pump number 1 is closest to the timing gear.
Send the turbo out have it serviced.

[Alan Wheeler]

To add to Pat, you should get hold of a good service manual. You are going to need to know torque settings and tolerances and it will be a great aid as to how to dismantle and re-assemble. It's not wasted money, it is a good investment to have onboard for those "ooops" type moments.

[markpj23]

Many thanks for the comments. I'm kinda disappointed that spare bolts don't find their way home though......