Hey guys I have a 351w to c4 setup I'm trying to install and I need to know some bolt torque down specs. They are transmission mount to transmission, transmission mount to crossmember. Motor mount to frame mount, and motor mount to engine block. Thanks for any help.
tranny mount to tranny 40-60 ft/lbs. tranny mount to crossmember 30-50 ft/lbs. motor mount to frame mount 20-30 ft/lbs. motor mount to engine 35-60 ft/lbs. specs from Ford Service Manuals, use oil or anti-seize on threads. David
all of that stuff we just tighten real good and thats it. weve never had a problem Ive never thought about the torque specs on those parts always just thought they had to be good and tight
Thank you dyent. Originally i was just going to make them real tight but would rather have them torqued to specs.
...motor mount to engine 35-60 ft/lbs... with this torque spec. what are you going to torque it to... don't forget to have your torque wrench calibrated before you start...
I would just go and use a setting in the middle along with lube/anti-seize and you'd be good to go......... David
why does Ford give such a wide range for torque specs, we are using a persision calibraded tool? some of my LSX torque specs. Cylinder Head Bolts (M8 Inner Bolts in Sequence) 22 lb ft Cylinder Head Coolant Plug 15 lb ft Cylinder Head Core Hole Plug 15 lb ft Drive Belt Idler Pulley Bolt 37 lb ft Drive Belt Tensioner Bolts 37 lb ft Engine Block Coolant Drain Plugs 44 lb ft Engine Block Heater 30 lb ft Engine Block Oil Gallery Plugs 44 lb ft Engine Coolant Air Bleed Pipe Bolts and Studs 106 lb in Engine Cross member Bolts (Large) 107 lb ft Engine Cross member Bolts (Small) 92 lb ft Engine Flywheel Bolts (First Pass) 15 lb ft Engine Flywheel Bolts (Second Pass) 37 lb ft Engine Flywheel Bolts (Final Pass) 74 lb ft Engine Flywheel-to-Torque Converter Bolts 44 lb ft Engine Front Cover Bolts 18 lb ft Engine Mount Heat Shield Nuts 89 lb in Engine Mount Stud-to-Engine Block 37 lb ft Engine Mount Through Bolts 70 lb ft Engine Mount Through Bolt Nuts 59 lb ft Engine Mount-to-Engine Block Bolts 37 lb ft Engine Rear Cover Bolts 18 lb ft Engine Service Lift Bracket M10 Bolts 37 lb ft Engine Service Lift Bracket M8 Bolt 18 lb ft Engine Valley Cover Bolts 18 lb ft Engine Wire Harness Clip Bolt 37 lb ft Engine Wire Harness Ground Strap Bolt 37 lb ft Exhaust Gas Recirculation (EGR) Valve Bolts (First Pass) 89 lb in EGR Valve Bolts (Final Pass) 22 lb ft EGR Valve Pipe-to-Cylinder Head Bolts 37 lb ft EGR Valve Pipe-to-Exhaust Manifold Bolts 22 lb ft EGR Valve Pipe-to-Intake Manifold Bolt 89 lb in Exhaust Manifold Bolts (First Pass) 11 lb ft Exhaust Manifold Bolts (Final Pass) 18 lb ft Exhaust Manifold Heat Shield Bolts 80 lb in Exhaust Manifold Pipe Nuts 26 lb ft Front Shock-to-Engine Cross member Bolts 48 lb ft Fuel Injection Fuel Rail Bolts 89 lb in Generator Bracket Bolts 37 lb ft Generator Rear Bracket-to-Engine Block Bolt 18 lb ft Generator Rear Bracket-to-Generator Bolt 18 lb ft Ground Strap Bolt (at Rear of Cylinder Head) 37 lb ft Ignition Coil-to-Bracket Bolts 106 lb in
who knows with Ford, all those specs where right from their 5 volume Shop Service Manuals that I have for 1974. Even my 68 Service Manual for Mustang had a range, but within 10 ft/lbs, perhaps they where covering for different bolt grades from 2 to 8....after looking at the chart below, kind of makes more sense now. Here is link to site with torque specs for bolts: https://www.boltdepot.com/fastener-information/bolts/US-Recommended-Torque.aspx site also has chart for markings of various grades etc., David
I kinda see your thinking but...they know what size/pitch the bolt is for the application so still ...why the 25 ft/lbs range? ...motor mount to engine 35-60 ft/lbs... even at that the bolts listed for the motor mounts are 3/8" grade 5 and the torque for them are are only 3 ft/lbs from Course-Fine ( not 25 ). my motor spec... Mount-to-Engine Block Bolts 37 ft/lbs...M10x1.5 (3/8" = 9.525 m/m) sorry...this has always been a pet-peve of mine...
I found this way back when I was doing my Machinist Apprenticeship 35 years ago, see the notation below the chart, especially #2. (sorry about chart being on its side.......) Also, the motor mount to engine block bolt is 7/16 - 14 with 4 center marks, which would indicate it is a grade 6 bolt and using the chart below, 55 ft/lbs. the threads are also triangular shape (not round) which acts as a locking type device. Even those tranny mount to crossmember nuts are Flanged/Stover nuts are again triangular shaped to act as locking nut. So when one starts taking into account grade of bolt 5,6 or 8, using lube or not etc, etc., yes, I can see why there is such a range........ I would just go and use the chart below, check bolt thread size, grade and cross reference with torque spec and Bob's your uncle........ David
my point...Ford Motor Co. knows what type of bolt that is being used in each application, so why give such a broad range torque spec? agree the chart tell us what to torque each of the different bolts but Ford chose the 7/16" bolt for... the motor mount to engine block bolt... referring back to my specs, they only give one setting...they know what bolt is being used...
Sorry been off here for a few days. Will definitely look into specs more as i dont want to screw up. Thanks 71 gold and everyone else.
