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Cadillac Repair/LOST CRANKSHAFT PULLY BOLT

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HELLO I HOPE THEIR IS SOME HOPE FOR ME HERE,LAST YEAR I REPLACE THE WATERPUMP ON MY 84 CADDY DEVILLE WITH THE 4100 MOTOR WHILE CHANGING THE AIR PUMP BELT I SEEN THE BOLT WAS NO LONGER THERE,I CALL EVERYWHERE  FROM THE DEALER TO MANY JUNK YARDS WITH NO LUCK.IF I KNEW THE SIZE OF THE BOLT MAYBE LOWES OR HOME DEPOT MAY HAVE ONE,,I HOPE,ALSO WHAT SIZE MOTOR CAN BE SWAP OUT TO REPLACE THE 4100,ANY HELP IS GREATLY APPRECIATED

THANX
CEDRIC

Answer
Hello,

I honestly don't know. I do not know if it even had a bolt. Some of these balancers were just pressed on, even though they had threads in the crank.
I haven't had to do work on a 4100 for 20 years and I have owned many. If pressed, should have a key and we used to smack them on with a big hammer until they would not go any farther. The only issue you might have is access which may require removing the front suspension with the engine in the car. See, generally the bolt would be used to draw the balancer down, but I remember running across no bolt on some GM engines. Once seated, its not coming off because of the key. We would take a block of wood 2x4 and hit the balancer (damper) with a 5 pound mini sledge until it seated. Has to be an even hit in the center. Never on the edges!
If you have a frame rail or something solid in the area, you can use a pneumatic press you can rent known as a porta-power and press it on that way too.
Socket size was generally about 1 5/16 and please realize that is from a very rusty memory on GM engines, which equates to about a 1" bolt, but I don't even know if they used SAE or metric and sure don't remember the depth or if it was fine or course thread.

As for swapping engines, you are out of luck. Anything you find in the junkyard for aluminum engines is probably junk from being over heated. 4.1. 4.5. 4.9. 4.3 north star. People did not realize that by the time the hot light came on the engine was already melting and the head gaskets would blow as a result of overheating.
Good luck!

http://www.autotheftexpert.com

With all this emission crap, you can't take a Chevrolet engine and stick it in. Bucket of worms so to say. Get that balancer pounded on and if the engine runs good drive it. Don't try to replace with something that has more problems. If you go above 1990 in an engine on a Deville, then you need the steering column, computer and VATS module with all the wiring harnesses. Nightmare!!!

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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