I have a 603.960 (124 300 turbo) with a seriously damaged short block. Can I use a 603.912 (124 300 non turbo) short block in this engine as is, will I have to make any modifications or will they simply not work together?

Thanks! jm

Turbo & non-turbo engines are very different even though they make look the same. Others have tried & the engine did not last very long.

__________________
Brian Toscano

Turbo motors have oil jets that spray the underside of the pistons. The jets help overcome the additional heat and stress imposed by the turbo. There might be other differences in addition to the cooled pistons, but that one difference is enough to make your non-turbo block unsuitable for turbo use.

You might be able to use it as a non-turbo.

are the piston oil sprayers part of the block, or are the
add-ons to the oil system? if they squirt the underside
of the pistons i would think they would be add-ons.

don

I'm not 100% sure but the difference is not just the oilers. I believe the pistons & crank are different. The non-turbo block won't have a turbo oil supply line, nor a return line. As far as external parts that would need swapped (at least) the injectors and injection pump are different as are the manifolds. The oil filter housing on the non-turbo may need to be swapped to get the oil cooler fittings.

__________________
Brian Toscano

The main differences are that the turbo engine has oil jets spraying under the pistons and also the valves are filled with nitrogen. On aftermarket turbos the return line for the oil is hooked up to the drain plug.

You could probably use a turbo shortblock in a non-turbo... definately not in the other direction.



Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E

This link is a picture of the return line on a STT turbo on a 300GD. It is connected to the drain plug.



http://www.offroad.no/snitz/topic.asp?TOPIC_ID=12070

The oil jets are factory-made, not aftermarket. Alignment is critical, having been done at the factory to line up with the funnel shaped hole leading into the internal cavities of the piston. Even with these jets and special pistons the system sees a relatively high thermal stress. Personally, I would devote my time and energy toward fixing what you have, or finding a decent, used turbo short block. The exhaust valves are sodium filled, BTW

Pistons are completely different...

You need the oil cooling passages to remove heat from combustion process. If you want to switch pistons, add oil cooling, possibly a different oil pump, etc etc...

You can convert your's to a non-turbo. No problems there!

Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E