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Hello,
I have owned my 86 951 for 5 years now. I am in the process of doing the timing belt/balance belt and front engine seals again. When I last did it (almost 5 years ago now), I didn't have any issues. This time around I cannot get the oil pump drive gear to budge. It is stuck! I did an extensive search and have tried all the suggestions from past posts. Heat, vise-grips, channel locks, puller, etc. Does anyone have any other suggestions? Thanks!
If all else failed, pry it off using the oil pump as a lever with something plastic or soft as to not damage the block.
Thanks Perry 951,
I was thinking the same thing as a last resort. I think I don't have to drop the oil pan all the way; but just the front part to clear the removal of the pump housing?
I have had a similar problem and I took some vice grips and used my grinder to grind the backside of the teeth down to fit better. Clamped down and pried with a screw driver.
You might want to mark the drive gear and the crankshaft with a Sharpie and bump the starter a few times to see if it is rotating. If you've got 2 people, hold it with a tool while bumping the starter. Mabe you can build a dam out of something so you can soak it in a good penetrant, like Kroil. If it rotates, then concentrate on cleaning up the exposed crankshaft really well with fine sandpaper.
Be very careful prying the oil pump. They aren't cheap to replace if you crack something.
Use a big set of pliers to see if you can get the oil pump drive gear to spin on the crankshaft. You can also use a cold chisel or punch and a hammer to get the gear to rotate. Once it's spinning, you should be able to wiggle it off.
Thanks for all the suggestions. The sleeve would not rotate/wiggle at all. I will give it another go at it today. I just had to step away for a few as I was getting quite frustrated.
Can you try to cool the crankshaft? Is the situation freting corrosion? Can you drill and tap two holes 180 degrees apart in the oil pump gear and then makeup a puller to remove it?
Thanks Perry 951,
I was thinking the same thing as a last resort. I think I don't have to drop the oil pan all the way; but just the front part to clear the removal of the pump housing?
Yes, the pan must be lowered because the lower portion of the pump is the front sealing surface for the gasket. You could reinstall with a little sealant and cross your fingers and hope for no leaks, or bite the bullet and replace the pan gasket.
I've had success with using the pump to free the drive gear in the past, so as long as you don't go crazy prying on it, it should turn out fine. I'd bet the drive splines are stuck in the pump and not on the crankshaft.
You'll also need to reseal the pump to the block with the anaerobic sealant of your choice.
Update: Success! Thanks for everyone's suggestions. I took harveyf's idea of building a "dam" out of a piece of 1.5" diameter hose and let the PB blaster soak the sleeve for three days. I just removed the hose and lo-and-behold, I was able to remove the sleeve with just my fingers!
Update: Success! Thanks for everyone's suggestions. I took harveyf's idea of building a "dam" out of a piece of 1.5" diameter hose and let the PB blaster soak the sleeve for three days. I just removed the hose and lo-and-behold, I was able to remove the sleeve with just my fingers!
05-08-2020, 11:56 PM
Oil pump drive gear stuck!!!
