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304 V8 Rocker Arm Pivot Bolt Install - Dr Terry
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HQ_SS_Andy Offline
#1 Posted : Tuesday, 21 June 2022 3:25:33 PM(UTC)
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Hi All.
I am wondering if the rocker arm pivot bolts in a 304 should be loctite'd in.
If not, what stops them from backing off ? There are no spring washers.

Also, torque spec is 24-32 Nm. Seems like a big range. Would it be best to just shoot for the middle (i.e. 28Nm) ?

Rgds,
Andrew.
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8D11PCH2 Offline
#2 Posted : Tuesday, 21 June 2022 4:50:05 PM(UTC)
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As per GMH service manuals just install them and torque them up to spec.
The rocker pivot bolt torque specs for Red & Blue 253 and 308 engines is 30nm - 38nm.

I always err towards the higher end of the torque spec range.
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HQ_SS_Andy Offline
#3 Posted : Tuesday, 21 June 2022 11:39:06 PM(UTC)
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Thank you 8D11PCH2.
Rgds.
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Dr Terry Offline
#4 Posted : Wednesday, 22 June 2022 7:26:31 AM(UTC)
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I've never seen one work loose. I have however seen them broken.

Don't over-tighten them, they are only 5/16 UNC, easy to break.

Dr Terry

Edited by user Wednesday, 22 June 2022 7:27:08 AM(UTC)  | Reason: Not specified

If at first you don't succeed, just call it Version 1.0
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Smitty2 on 23/06/2022(UTC)
HQ_SS_Andy Offline
#5 Posted : Wednesday, 22 June 2022 1:07:25 PM(UTC)
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Thanks Dr. Terry.
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Smitty2 Offline
#6 Posted : Thursday, 23 June 2022 9:06:57 AM(UTC)
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Originally Posted by: HQ_SS_Andy Go to Quoted Post
Hi All.
I am wondering if the rocker arm pivot bolts in a 304 should be loctite'd in.
If not, what stops them from backing off ? There are no spring washers.

Also, torque spec is 24-32 Nm. Seems like a big range. Would it be best to just shoot for the middle (i.e. 28Nm) ?

Rgds,
Andrew.




ps.. don't forget the rocker arm pivots only go on one way too
(don't get this wrong, if you do they 'die' rather quickly)

Club circuit racing...the best fun you can have with your pants on
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HQ_SS_Andy on 23/06/2022(UTC)
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