crank pulley question..
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Senior User
Joined: Jul 2003
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From: Chicago, IL
crank pulley question..
everey Ford engine i've dealt (SB v8s, V6s, & L-4's) in the past only allowed the harmonic balancer or crank pulley to go on one and one way only for timing purposes.
is this also true for the 300 l-6? i tried timing the engine yesterday, and the mark wouldnt show up with the light. i go under the truck with the strobe and find it to be just about 180* off.
if it was a 4 or an 8, i know i could get around that problem by placing the pickup clip on a wire 1/4 of the turn of a rotor (on a 4, it'd be the next or previous wire) but i dont think its possible on a 6.. or am i wrong? or by some miracle, is the pulley a 3-bolt? right now the engine is timed by ear and seems to perform better than before, but i need it propertly timed to adjust the carb and have it ready for emissions-testing.
is this also true for the 300 l-6? i tried timing the engine yesterday, and the mark wouldnt show up with the light. i go under the truck with the strobe and find it to be just about 180* off.
if it was a 4 or an 8, i know i could get around that problem by placing the pickup clip on a wire 1/4 of the turn of a rotor (on a 4, it'd be the next or previous wire) but i dont think its possible on a 6.. or am i wrong? or by some miracle, is the pulley a 3-bolt? right now the engine is timed by ear and seems to perform better than before, but i need it propertly timed to adjust the carb and have it ready for emissions-testing.
Posting Guru
Joined: Jun 2002
Posts: 1,288
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From: redding U.S.A.
crank pulley question..
its very common for the harmonic balancer to slip over time.
You gotta find zero the old fashioned way and scribe another line into the ring. Try puting a line of white out on the line after you scrape it, it'll make it easier to see.
You gotta find zero the old fashioned way and scribe another line into the ring. Try puting a line of white out on the line after you scrape it, it'll make it easier to see.
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Senior User
Joined: Jul 2003
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From: Chicago, IL
crank pulley question..
after doing some research, it turns out that the 300 is internally balanced, so the harmonic balancer doesnt exsist, therefore the timing mark cannot have slipped as stated above.
I still havent found any info on the crank pulley. anyone else have info?
I still havent found any info on the crank pulley. anyone else have info?
Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
crank pulley question..
The 300 has what is mistakenly referred to as a "harmonic balancer" It is actually more correctly called a damper pulley on any engine. The outer ring slipping is a fairly common failure mode.
Posting Guru
Joined: Apr 2003
Posts: 1,153
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From: Venezuela
crank pulley question..
To relocate the timing mark, you can remove vibration damper bolt using a 15/16" socket and bar, you'll need also block engine because it is about 130 -150 lbs-ft torque.
After that you can see the crank shaft key, it is located exactly at TDC, I mean; if you rotate engine until C.S. key is right up then you can make a new mark in outer ring side to 0°.
Hope it helps you. Regards;
After that you can see the crank shaft key, it is located exactly at TDC, I mean; if you rotate engine until C.S. key is right up then you can make a new mark in outer ring side to 0°.
Hope it helps you. Regards;
Posting Guru
Joined: Jun 2002
Posts: 1,288
Likes: 1
From: redding U.S.A.
crank pulley question..
harmonic bbalancer isn't the correct term... sorry.
It does though have a rubber "bushing" ring that will, and does slip on many engines over time.
I'm pretty sure its just there to keep the timing mark readable and not bouncing around too much.
It does though have a rubber "bushing" ring that will, and does slip on many engines over time.
I'm pretty sure its just there to keep the timing mark readable and not bouncing around too much.
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Senior User
Joined: Jul 2003
Posts: 195
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From: Chicago, IL
crank pulley question..
I took a good look at it today and you were all right! it does have that ring. i also saw why it slips.. i'm used to V-6 and V-8 harmonic balancers which drive the pulley directly from the hub rather than the outer ring like on this engine... forcing the outer ring to drive will definetley cause it to slip
i appreciate your help guys.
i appreciate your help guys.
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