Fine question Mike, as those few bolts needs great clamping force, which brings up a very unusual starting problem I had with Mangusta 1156 prior to shipping to Detroit for Eyes On Design in 2015. My car would turn over too slowly and even melted one lead battery clamp. Made no sense and even ohms load test on grounds and all relevant issues showed all fine. So one evening with car lifted 5 or so feet up while finishing show prep I had my helper reach up to start car as I was checking for an exhaust leak. To my surprise as it slowly cranked I saw electrical arcs emanating from the bell housing. WHAT? We found that the large bell housing bolts to 302 block were loose! What, no way as this car only has 3,400 miles. Well apparently the production work crew at de Tomaso ate too much pasta for lunch and someone forgot to torque the bolts and with ground strap bolted to trans then only way to ground was though speedo cable, shift linkage and bolt threads! Also the reverse wires would have taken this load but my car did not come with said switch. So our ohms test were ok BUT not under starter amp load. I should have carbon pile load tested the ground. I’ve added that test to my repair shop protocol ever since when checking out starting issues. So we red Locktited and torqued the bolts and car then started normally. Just to be sure I placed a large copper ground strap, painted black so to hide, from frame to timing cover along with the original strap. This was 10 years ago though I think I set them at 90ft/pds. Take care, Jeff Cobb Sent from my brain.
On Mar 15, 2025, at 3:09 PM, Mike & Elizabeth <mbefthomas2@gmail.com> wrote:
If there is anyone out there, can you tell me the torque spec for the ZF to bell housing bolts? We loosened one to use with the engine hoist and I need to tighten it back properly.
Thanks, Mike Thomas _______________________________________________
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