3.66/3.74/3.70 Yanmar Head

[ZoO]

I have a question, in that did yanmar use the same stock Head in the 366,374, and 370 engines or did they atually recast a different head 3 times?

I know TK uses a different part number but that does not mean anything. I have personally put a 3.66 onto a 3.74, and it worked and ran for years. I am wondering if I can do the same between a 66 and a 70.

[wilt]

Hi zoO,
not sure but I've,also worked on theses engines 3cylinders the 66,70,74 equates to the bore size in mm I think, so its possible the head gasket sizes might be different rather than 3 different cyl heads,again I'm not sure it's been a long time since I've done any engine overhauls,as its all recon take one out fit another.

[ZoO]

thanks, that i what I thought. when I did the 366 head on the 74 block I paired it with the 74 gskt.

[ZoO]

will let everyone know if the 66 head will work on the 70 block, unless someone knows better.

[Mick Carroll]

It will work.

[ZoO]

Actually the head won't fit. the 3.70 is a complete redesign from the 66 and the 74. The block and head are longer with completely different water jacket placements, bolt configurations, and cylinder placements. I have a pic if anyone is intereted.