Loose Bolts

[Jim Nolan]

Just an FYI I was pulling my plenum and injector housings so I could send them for port and polish and the first 4 outside bolts on both sides of the injector housings were loose. I mean they had zero torque on them. I think this is the first time this engine has been torn down this far. It's a '92.

[Jeffvette]

It happens, I've had a few motors that have been like that. Might cause a small vacuum leak that is hard to track down. They are not torqued down very hard in the first place.

[A26B]

It happens, I've had a few motors that have been like that. Might cause a small vacuum leak that is hard to track down. They are not torqued down very hard in the first place.

If low torque results in loosening over time, then I would recommend application of a low strength Loctite or similar brand product. That type of vacuum leak would be a real bear to track down....almost like your secondary shaft seals Jeff. Wow!!

[Locobob]

If low torque results in loosening over time, then I would recommend application of a low strength Loctite or similar brand product. That type of vacuum leak would be a real bear to track down....almost like your secondary shaft seals Jeff. Wow!!

:iamwithst Use a low strength Loctite when you reassemble - an ounce of prevention :thumbsup:

[Paul Workman]

I found my IH bolts in much the same situation - first time I pulled the plenum. One was little more than finger tight! A little BLUE Locktite seems to be doing the trick.

I suspect too that after using LT or other goops one should run a thread chaser thru the bolt hole to clean out the threads of any residue before reinstalling the bolt and torquing it down in the interest of uniform bolt pre-load. (Or, at least I would on an iron head. running a tap thru an aluminum part gives me some pause, how-some-ever.).

P.

[tomtom72]

Yea I noticed the same on my 90 when I had to replace my bad OE injectors. You should have seen how loose the CCVB cover bolts were also. Made a mess of my valley!

W/pump T/Q = 26 N.m or 20 Lb/ft

I/H bolts = 26 N.m or 20 lb/ft, my 90 FSM has no pattern diagram.

Plenum bolts = 26 N.m or 20 lb/ft, see pattern in FSM

T/Body bolts to plenum = 26 N.m

CCVB cover bolts = 10 N.m or 89 In/ lbs

:cheers:
Tom