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putting in a new rear main seal in a LQ9. they sent me part number 89060436 which from what i gather is the new design and 12585671 is what was in it. they are different widths and the new style isnt gonna set as far deep as the old one. is this ok? just drive the new one in flush on the outside? last thing i wanna do is get it all put back together and have to change it out.
Wonder if that has something to do with the fact that some of the older truck cranks had the wider crank flange or was it that they didn't see the need to run a thicker seal and went to the thinner one.
89060436 is the correct seal. The seal has been revised a few different times. Install seal with "This Side Out" and seal housing to the inner edge of the 45* taper in rear cover. You'll have around 1/8" from inside seal to the inside recess in cover.
89060436 is the correct seal. The seal has been revised a few different times. Install seal with "This Side Out" and seal housing to the inner edge of the 45* taper in rear cover. You'll have around 1/8" from inside seal to the inside recess in cover.
soi need to drive it in just a little more
Last edited by DuckHunter5.7; Jan 6, 2022 at 10:00 PM.
89060436 is the correct seal. The seal has been revised a few different times. Install seal with "This Side Out" and seal housing to the inner edge of the 45* taper in rear cover. You'll have around 1/8" from inside seal to the inside recess in cover.
^ Yes ^
I can confirm 89060436 is indeed the correct seal. Just checked my Amazon orders and I received part number 89060436 for my LQ9 and no leaks since 2018 install.
I can confirm 89060436 is indeed the correct seal. Just checked my Amazon orders and I received part number 89060436 for my LQ9 and no leaks since 2018 install.
did you drive it flush with the edge like mine is or further in?
Remember these seals are installed dry. If you oil the seal lip or the crankshaft it will probably leak.
i installed it dry and this side out like it says. cleaned the surface the seal would be riding on as well just didnt know how far to drive it in. appreciate it bud!
It should work fine flush with cover. Bottom line - should run on smooth portion of crank and not blow out (not a concern on non boosted app). Installing dry is key. Glad you knew that.
If I'm not mistaken, I believe the earlier Gen 3 engines (4.8-6.0) had a thicker rear flange on the back of the crank. I have always suspected that the older trucks with the thicker crank flange were much less susceptible to premature rear main seal leaks because of this, hence the two different rear main seals/seal pn's ...Idk, could be me over thinking things too
Remember these seals are installed dry. If you oil the seal lip or the crankshaft it will probably leak.
Mind if i ask now on the front seal it says coat a thin film of oil on the outside of the front seal as well as hub of the balancer before installing according to the haynes manual. Is this completely different from the rear mail seal?
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rear main seal not the same 
