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Author Topic: 4.1 Cam bearings?  (Read 2855 times)

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Offline Forzfed

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4.1 Cam bearings?
« on: June 01 2017, 04:39:55 PM »
I was looking at my 4.1 and I see that the back cam bearing isn't grooved, still have to check the front one.  My roller cam isn't grooved, so I believe my cam bearings need to be or at least the front one.  Anyone know what bearings to use?
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Offline earlbrown

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Re: 4.1 Cam bearings?
« Reply #1 on: June 02 2017, 06:33:26 AM »
Fire up a Dremel and groove the front journal in the block.    Then you can use plain ole 14 bolt bearings with a nongrooved roller cam.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Forzfed

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Re: 4.1 Cam bearings?
« Reply #2 on: June 02 2017, 09:02:18 AM »
That is only needed for the front one, right?  The back doesn't need to be grooved?
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Offline earlbrown

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Re: 4.1 Cam bearings?
« Reply #3 on: June 03 2017, 03:52:35 AM »
Just the front. That's what feeds the DS lifter galley
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Forzfed

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Re: 4.1 Cam bearings?
« Reply #4 on: June 03 2017, 04:49:14 PM »
Thanks, Earl!  That is what I thought.  If it didn't have the groove in the front would oil still get to the DS during idle and lessen on higher rpm?  Or no oil at all?
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Offline earlbrown

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Re: 4.1 Cam bearings?
« Reply #5 on: June 04 2017, 04:36:29 AM »
none at all unless you have a grooved flat tappet cam journal.


Best thing to do is to groove it and be done.  The end.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock
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