Merc 900 valve Springs and lifters

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03-11-2017 | 09:09 PM

#11

getrdunn

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From: NW Michigan

Quote:

Originally Posted by getrdunn

Makes no sense I know but pm me your ph number and I will tx you cam card.

Sent card via tx!

03-11-2017 | 09:28 PM

#12

getrdunn

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From: NW Michigan

Sutphen 30 I think is who uses the bullet replacement cam. Will be interesting to see if he chimes in also. Those springs that are on card seem like the same ones on 741 hyd roller cam.

03-11-2017 | 11:20 PM

#13

I'CE

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Quote:

Originally Posted by getrdunn

Which comp springs? I only did a quick search but couldn't find any comps similar to the recommended crane spring #99876.

160 closed @ 1.968
468 open @ 1.348

Seems pretty light pressures for that cam but it's what the card shows.

change the installed height to 1.88 or even 1.90 and those pressures will bump up, but as jd said still seems light

03-11-2017 | 11:21 PM

#14

Unlimited jd

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From: Taunton Ma

These will go back pretty much 100% stock, they have 82 untouched hours now. Still have merc seals. If upgrades are going to be made these will be sold and a couple whipped 557's will replace them.

03-11-2017 | 11:21 PM

#15

Unlimited jd

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From: Taunton Ma

Quote:

Originally Posted by I'CE

change the installed height to 1.88 or even 1.90 and those pressures will bump up, but as jd said still seems light

I'll have to look at specs but 1.88 will bind
Just checked, bind is at 1.200, with .672 lift too close for my liking even after lash

Last edited by Unlimited jd; 03-11-2017 at 11:26 PM.

03-12-2017 | 10:48 AM

#16

JJ30

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Quote:

Originally Posted by getrdunn

I have 2 sets of springs, retainers,seals and keepers at work. I'll post the part numbers tomorrow.

03-12-2017 | 10:53 AM

#17

sutphen 30

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From: taxachusetts

Quote:

Originally Posted by getrdunn

Sutphen 30 I think is who uses the bullet replacement cam. Will be interesting to see if he chimes in also. Those springs that are on card seem like the same ones on 741 hyd roller cam.

we used pac springs w/ a seat pressure of 225lbs.

03-12-2017 | 11:06 AM

#18

getrdunn

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From: NW Michigan

Quote:

Originally Posted by sutphen 30

we used pac springs w/ a seat pressure of 225lbs.

Sounds more realistic. Why would crane have 99876 on the cam card I wonder. Makes no sense unless it's an errror. I big one though. Comp 943 would sound much closer. Will be interesting to see what jj30 has for his.