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locry 06-13-2005 02:55 AM

603 prechamber clearance Q
first off,

thanks to all who replied to my 603 head install questions.

anyway, what should be the clearance between prechamber and the piston depression? the reason i ask is because my cyl head was shaved. the prechambers were installed without adding shims. I'm not sure if this is acceptable. I did measure how deep the depression on the piston is and the protrusion of the prechamber with the head. it seems there is adequate clearance between prechamber and piston even without the gasket.

Should the clearance be exact because of compression ratio concerns or should it just clear the piston?

and 2 other things, while vacuuming the top of the block i noticed oil seeping up between the block and the cylinder sleeve, is this normal? there is an ever slight gap between the 2 if i look close enough.

AND while cleaning the top of the pistons, i noticed that i could move them a tad sideways(rear-to-front of block), normal?

sixto 06-13-2005 03:32 AM

The extension of the prechamber tip beyond the surface of the head is spec'd to be 7.6 - 8.1 mm. Spacers are available in 0.3, 0.6 and 1.0 mm... uhh... denominations. My guess is that the gap between the prechamber and the piston influences spray and propagation. If it's just for clearance, 8 mm is a canyon.

I don't recall being able to move the pistons but I didn't try.

I don't know what seam you're talking about where you're able to suck oil. Maybe it's not a seam but an oil passage filled in with gasket remnants?

95 S420
87 300SDL

locry 06-13-2005 03:38 AM

its definitely not a passage. when looking down on the block, around any of the cylinder bores, i can see the faint outline of the cylinder bore sleeves. (are the sleeves supposed to be separate from the block? or have mine been resleeved) The oil is seeping between the block and this outline(cylinder bore sleeve). makes sense?

locry 06-13-2005 03:39 AM

oh, and thanks for the spec btw. :)

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