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| Re: 3J Improved Production coupe- Racing Videos & Progress |
Subject: Re: 3J Improved Production coupe- Racing Videos & Progress
by mcgee on 2015/9/7 9:27:37
I'm having a second guess about the problem.
I spoke to the machinist today they are happy to help fix the problem (if it is a long valve) so that part is covered.
My concern is that I may have not really reset the lifters properly. 1-2mm extra long valves should be taken up by lifters which have about 4mm total travel.
Looking into how they work I still don't understand why they wouldn't have bleed down the the required height. Do the CA18 lifters actually bleed back down on their own or are they a one way, pump up only deal?
I wonder if by following the guide below I have actually pumped them up to full height before installing them? If so, then why did they not bleed back down when the cam was installed.
http://www.twinturbo.net/nissan/300zx/forums/technical/view/917346/Lifter-Rebuild-101.html
Using the above guide I'm pretty sure the lifter is reset back to full extension? Is that the way others see it?
My reasoning for coming to this conclusion is with oil in the "lower lifter body", then bleeding all the air out the lifter body returns to the springs natural height. The check valve draws oil in until the spring reaches this height, at this point the lifter is incompressible, as it is full of oil. Is this not full lifter extension?
However without oil the spring is free to move and the lifter body compresses. Should they not be installed with air in the lower lifter body and just bleed through cam rotation and spring pressure. When the engine oil pressure comes up, wouldn't this fill the reservoir and with successive cam rotations will compress the internal spring and oil will be drawn in through the check valve until the lash is correct and the lifter is bled.
Maybe Ive proved my lifter hold pressure and have not reset them?
How have others reset their lifters when they have replaced cams or valves?
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