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1962 Cadillac Sedan Deville



The discrepancy: Leaking oil from the front timing chain cover seal.

Corrective action:

Loosen all the accessory belts. Jack up the car and place it on two front jack stands.

All the work can be done from under the car. On jack stands
I would say mark the pulley to balancer alignment, but it's probably to greasy. Try anyway. Putting back the pulley was the hardest part of the job. Minus the three trips to the auto parts store. I hate when they re-box the wrong parts. Remove the six 1/2" hex head 5/16-18 bolts holding the pulley to balancer.
Harmonic Balancer stopped from turning This is were the Frankenstein Tool Works Company is enlisted. The Cadillac manual says you can use compressed air @110 psi on the number one cylinder at TDC to hold the crankshaft from turning when removing the 13/16" crankshaft bolt, but that's more work. I used a 1"x1/4" flat stock to hold it in place. Use a grade 5 or higher bolt or it will shear off in the balancer. The chain is wrapped around the frame for torquing the bolt to 110 ftlbs.
Use a Harmonic Balancer Puller to remove harmonic balancer. With the balancer off pry out the seal with a seal removal tool. Be careful not to grab the lip of the timing chain cover. Just the seal.
Seal removal tool

With the seal out. Clean the seal recess. Put some sealant on the outside diameter is the seal and press into place. There is no room to swing a hammer, so you'll need to use a socket and the crankshaft bolt with a plate to press the seal into place.

Tool set up Tool setup

Where the seal rides on the Harmonic balancer it tends to groove the surface. To repair the groove and restore a smooth surface for the seal, we press a thin sleeve over the damage. Clean shaft with some fine scotch brite or sand paper.
Grooved harmonic balancer
Harmonic balancer with sealant harmonic balancer and sleeveharmonic balancer sleeved Measure the position of the groove to the sleeve. Some sleeves allow removal of the flange after installation. If needed. If not leave it on. Put some sealant on the top of the shaft and place the sleeve on top. If the groove is real deep you can fill it with metal epoxy. Place the sleeve installation cap onto the sleeve and press the sleeve into place.
Clean the shaft and oil it before installing the balancer on the crankshaft. Torque the crankshaft bolt to 110 ftlbs. 1962 Cadillac 390 cuin V8
torguing harmonic balance
Now the hardest part of the job. Putting back the pulley. Line up the shim plate on the bench first. There are two different size holes on the pulley. The small holes are for the bolts and the larger ones fit over the stubs on the balancer. Use the "O" stamped in the plate and mark pulley for alignment. Then place the pulley in position and keep spinning it until all the holes line up. Install the plate and two bolts on the top. Don't tighten all the way. Place the belts on the pulley then install the rest of the bolts. Torque the bolts to 20 ftlbs.
Harmonic balancer pulley doubler Reinstall the belts. Remove the jack stands and your are good to go! No more post engine run drip.
Part #'s: For 1.625 Harmonic Balancer Shaft Seal # 16084 For repair sleeve # 99162
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