engine rebuild

[whiterover]

Hi Everybody. White Rover from New Zealand here. I am hoping that someone can tell me that the pistons bo not come completly to the top of the block on a 1974 2200 4cyl motor.
I have asembled the motor, with new std pistons after deglazing the bore, Fitted a new crankshaft with new big end and main shells. I find that the pistons do not come to the top of the bores. The new parts fitted are the pistons, which measure the same as the old ones, the only other new part is the crankshaft , so it should be good.
It must be correct, but I will happily carry on with the assembly if someone can confirm that the pistons do not come to the top of the bores.:?:
John.

 

[harveyp6]

As far as I can think offhand, because the combustion chambers are in the piston, not in the head, if the piston came all the way to the top of the bore, then as the bearing shells wore, or if you over-revved the engine, the pistons would hit the head because at the top of their stroke the clearance would only be the thickness of the head gasket.

 

[robgee1964]

I am hoping that someone can tell me that the pistons bo not come completly to the top of the block on a 1974 2200 4cyl motor.

How far from the top of the block are they, and what was it like prior to stripdown? Any significant gap does sound a bit strange, the combustion chamber is supposed to be in the piston crown, not piston crown plus top bit of cylinder. Did you check distance from gudgeon pin centre to piston top?

Plenty of diesels have a flat head, and on some of those the piston top actually sits slightly above the block, at TDC.

It would be easy to check the overall stroke, before you put the head back on. At least that would confirm that the crankshaft is correct.

 

[whiterover]

Thanks for that.
I have checked the stroke and it is correct as per Haynes, so I will continue to assemble the engine. I have noted the comment that the oil pump lasts for ever, but I do wonder about orderning new rotors for it.
John.

 

[chrisyork]

I don't like messing with oil pumps unless you have a good reason to. The tolerences are so fine that you can be as likely to make it worse as better!

Chris