SUCCESS!
The new front and rear motor mounts on my
'54 3100 235 are in. Thanks to all of you that helped me with your ideas, personal experiences, and encouragement.
The process wasn't as difficult as I had anticipated ... 'course Darryl at the shop did the job instead of me.
Not saying that this is the "best" or the "right" way to do the job. But this is a recap of our installation and a list of the hardware used.
Follow the instructions in the
Shop Manual 6-13, 6-14. Place the rubber cushion for the front motor mount into the retainer with the slots facing up. The radiator does not need to be removed for access, but you probably want to remove the hoses.
Insert the end carriage bolts into the front mount through the rubber cushion, the retainer, and the cross member before adding the shield. I don't believe that my 3/8"-24 carriage bolts were drilled for a cotter pin. I used flexible lock nuts to secure the end bolts.
The middle carriage bolt on the drivers side of the front motor mount drops into place through the square hole in the front plate with a little wiggling and the motor raised about an inch.
The middle carriage bolt on the passenger side binds against the timing chain cover which prevents it from dropping through the front plate. Darryl
ground off one side of the carriage bolt head to allow it to clear the cover. I'm not overly concerned about grinding the bolt head because the bolt on the drivers side is intact, and because a bolt with a ground-off side is still better than what I have had for the past 12 years ...
3/8" hex bolts with NO NUTS!The washers on the middle bolts that are in the front mount must cover the metal sleeve inside the rubber cushion, but not touch the cross member. GM specs are for 13/16" OD. The washers that I bought were 15/16" OD. So he used stainless 3/8" washers and enlarged the hole to accept the 7/16" bolts.
< CLICK > Completed bolts, washers, & nuts on front mount."All bolts should be kept tight except the two self-locking nuts on front motor mount. Self-locking nuts should be tightened securely but not too tight to cause damage to the front support assembly."The rear mounts were installed as described in the Shop Manual. One of the upper mounts from the Truck Shop (made in India) was identical to the pic in the Shop Manual and to the one that was on the truck. The other upper mount was different. A corner had to be ground down to fit. I shoulda checked them when they arrived. Torque the rear mount bolts to 65 ft-lb.
I noticed a little engine vibration through the steering wheel after the new mounts were installed. We had checked the clearance between the plate and the retainer on the front mount before installation per instructions in the Shop Manual. The clearance seemed OK. I won't be able to fully test drive it for a couple of weeks to see if I have a problem.
FRONT MOUNT HARDWARE:> Shield - GM #3656502; Filling Station #TR-182
> Cushion Assembly - GM #3657520; Filling Station #CV-335A
> Plate - GM #3657522, used original plate that was on the truck
> Retainer - GM #368449, used the original retainer that was on the truck
> Middle Bolts (2) - GM furnished by engine plant; Fastenal #21879 7/16"-14 x 2-1/4" Zinc finish SAE J429 grade 5 round head carriage bolt
> Middle Washers (2) - GM #352282 7/16" ID, 13/16" OD, 0.062 thick; we used 3/8" stainless washers that are the correct OD and filed the hole to 7/16". the 7/16" washers that I bought were 15/16" OD and might touch the crossmember.
> Middle Nuts (2) - GM furnished by engine plant; Ace Hardware 7/16"-14 top lock nut.
> End Bolts (2) - GM #3701135 3/8"-24 x 1-7/8" carriage bolts; used the GM carriage bolts that were on the truck. If you need the end bolts, you could use Fastenal #0159808 3/8"-16 x 2" Zinc Finish SAE J429 Grade 5 Short Square Neck Round Head Carriage Bolt
> End Washers (2) - GM #365685 3/8" ID, 1-1/4" OD, 0.187 thick; Fastenal #11101273 3/8" x 1.250" x 0.125" Thick Zinc Finish Extra Heavy Fender Washer
> End Nuts (2) - GM #117212 3/8"-24 hex; Fastenal #37464 3/8"-24 Cadmium Finish Grade A Flexible Lock Nut
REAR MOUNT HARDWARE:> Upper Mounting Assy (2) - GM #3705444; The Truck Shop #54-07609
> Lower Mounting Assy (2) - GM #3705447; The Truck Shop #54-07610
> Bolt (2) - GM #3705450 1/2"-13 x 3-1/2; The Truck Shop #54-07611
> Bolt Lock (2) - GM #3717280; The Truck Shop #54-07612
Assembly Manual part numbers & locationsMaster Parts Catelog part numbers and descriptions 0.002 - 0.027 + illustration p. 95
