timing chain skipped a tooth
Posting Guru
Joined: Aug 2000
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From: (near) Denver USA
timing chain skipped a tooth
The only other issue is the distributor. Since cam position determines which stroke the piston is on (e.g., power stroke or intake stroke), you may have to rotate the distributor after you line up the cam and crank sprockets.
Don't mess with the distributor until after you get it all back together. Then, turn the crank to the TDC marker and pull the distributor cap.
If the rotor is pointing to the cap #1 terminal, you're good to go. Otherwise, rotate the distributor 180 degrees to get the rotor pointing to the #1 terminal.
Don't mess with the distributor until after you get it all back together. Then, turn the crank to the TDC marker and pull the distributor cap.
If the rotor is pointing to the cap #1 terminal, you're good to go. Otherwise, rotate the distributor 180 degrees to get the rotor pointing to the #1 terminal.
Senior User
Joined: Sep 2002
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From: prince george canada
timing chain skipped a tooth
no i am putting in a new double roller with the three crank keyways so i can advance the cam timing 4 degrees
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Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
timing chain skipped a tooth
Set your cam timing straight up. The production units retarded the cam timing in the crank sprocket. At least in the motors I have taken apart. Check the oem crank sprochet with the multi keyway unit.
It is quite common for the OEM setup to skip a tooth due to the use of nylon cam gears. If an aftermarket setup is used they can wear to the point of skipping a tooth.
It is quite common for the OEM setup to skip a tooth due to the use of nylon cam gears. If an aftermarket setup is used they can wear to the point of skipping a tooth.
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Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
timing chain skipped a tooth
Correct, set it at "0", -or as we say "straight up"!
If you compare the OEM type crank sprocket with the good name brand aftermarket sprocket you can see they had everything set up at -4. Just put the gears together and line up dots, and keyways, until they all line up. The aftermarket sprocket will be in the -4 position.
If you compare the OEM type crank sprocket with the good name brand aftermarket sprocket you can see they had everything set up at -4. Just put the gears together and line up dots, and keyways, until they all line up. The aftermarket sprocket will be in the -4 position.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
timing chain skipped a tooth
Then your OEM timing set had been changed out to a straight up set somewhere in it's life. Put the new set in straight up, it will advance the cam versus the old worn one anyway. If your engine has many many miles you still may want to consider a rebuild. You have many options then.
Posting Guru
Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
timing chain skipped a tooth
When Ford introduced the M-blocks (351M/400) in trucks in 1977, they went back the the original wider chain and sprockets and did away with the retarded cam timing set that they used in cars starting in 1973.
If your engine was an original truck engine, it didn't have retarded cam timing.
Just use the 0 position on the aftermarket timing set.
If your engine was an original truck engine, it didn't have retarded cam timing.
Just use the 0 position on the aftermarket timing set.
