worn or loose timing belt?
8 to 10 degrees.
It should be 6 degrees before tdc, just make sure you disconnect the distributor's computer control wiring harness before you adjust, and check the timing with a timing gun.
C3I ELECTRONIC SPARK TIMING (EST) FAILURE is code 42 timing can be off by a lot of factors check vacume leaks plugs wires etc..
The timing mark on all 305 to 400 small block Chevrolet engines from 73 to 87 is on the hamonic balancer which is the pulley behind the crankshaft and has no belt grooves...smooth with a split line on it....that line is the timing mark.
try searching google for the FSM for your vehicle to download. I found mine for free...very helpful
No.
Yes you can. There the same. Just take the parts / sending unit out of the 1987 tank and install them in the 1986 tank.
there is no timing belt it has a timing chain
18436572
Yes
On my K5 the timing tab was not there I had to buy one from a parts store.AnswerOn the k5 I have there was no timing tab I had to buy one from a parts store. TDC mark is white or just a cut. This is found behind the fan nearest the motor. It can be hard to see. When you find it mark it with something white (white out, paint, ect.)
The 1986 Mercedes-Benz timing marks can be found on the main pulley. The timing marks will be scattered around the outside of the pulley.