HT4100 4.1, 4.5, 4.9 Discussion, Conflicting torque information in Cadillac Engine Technical Discussion; I have gotten conflicting torque specifications and as a result it may have caused me to strip out one of ...
I have gotten conflicting torque specifications and as a result it may have caused me to strip out one of my head bolts. I have a '92 Deville w/4.9 of coarse aluminum block. I have gotten different info concerning the torque on the head bolts. One source (a Hay's Manual) says 1st 38 ft/lb, 2nd 68 ft/lb and bolts 1,3,4 3rd 90 ft/lb. I actually started wrong by looking at the wrong chart and did 1st 35, 2nd 48 and then procedid to do the rest at 60 ft/lb but the first bolt stripped at that setting before reaching 60. Was my block weak already or is the chart on page 2B-2 of the Hays GM Cadillac Deville 86 thru 93 book wrong listing the setting for 1,3 and 4 @ 90 ft/lb? Could someone tell me what the current specs directing cadillac mechanics are? And also I don't have $350 to purchase an 11 x 1.5 timesert kit. Someone else told me to use a 12 x 1.75 heli-coil kit for the stripped out number 1 head bolt. I could really use some expert advice here please, and thank you!
If you've stripped the threads in the block, then you're probably going to need the correct Heli-coil set from the dealership and work from there. As for the stripped thread, chances are that by following the wrong steps you may have done the damage yourself.
As for the Haynes manual, I've used that on several jobs concerning the heads, and the torque sepcs in there seem to be right; as of yet, I've had no issues with my own rebuilt 4.5 liter swap for my '87 Seville.