View Full Version : Anybody else have this problem?
01-18-2009, 12:19 PM
I was curious if anyone else has an issue with cracking their upper intake manifolds along the runners when torquing them down.....I've got my torque wrench set to 18 ft. lbs. like it should be and I've now cracked my 2nd intake in two places!! Is there some new torque spec that I don't know about?
01-18-2009, 02:29 PM
Are you tighting them in the correct order?
01-18-2009, 02:41 PM
What he said
01-18-2009, 02:52 PM
From what my Haynes manual says.
Torque to 89"/lbs and working from center outwards.
01-18-2009, 06:14 PM
Yeah. The lower intake is the one that requires 18 ft/lbs. The upper intake is only gutten tight. I usually use an air ratchet and a long extension to eat up some torque.
01-18-2009, 08:12 PM
In my haynes manual it states that the upper should be tightened to 18 ft lbs and the lower should first be tightened to 62 in lbs and then to 115 in lbs.......I'm pretty sure I'm tightening in the right order (starting with the center two then working my way out with a cross pattern).......maybe I should just stop salvage yard hopping for replacements...
01-18-2009, 08:30 PM
I would try torquing them in 5 pound steps. Torque everything to 8#, then 13#, then 18#.
I checked my '02 service manual and they have the same torque specs.
01-19-2009, 09:48 AM
Thanks.....I'll try that when I feel like hunting around for another one
01-19-2009, 11:45 AM
Yeah he has the torque specs right. I would just tighten them with a ratchet next time, don't torque them. The problem with getting parts from a salvage yard is you never know what the part has been through.
fieromutt on 60degreev6 has a upper for sale. http://60degreev6.com/forum/f105/3400-part-out-t42080
01-19-2009, 09:27 PM
and r u using an el cheapo torque wrench. cause i had a cheapo from walmart that some one bought me and i ended up busting off a bolt in my trans when i tightend down my trans pan
01-20-2009, 01:21 AM
The torque specs you have for the LIM bolts are for the old design gaskets which either lack the metal inserts or full metal construction.
01-20-2009, 01:54 PM
It's not quite a cheapo but almost there......I've used those torque specs on the lower when I replaced the gaskets with the upgraded design, no problems yet......When it warms up I'll go hunting around again.....hopefully I won't crack it this time...
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