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Verifying TDC on a dampner (timing chain slack)
#1947676
11/08/15 08:17 PM
11/08/15 08:17 PM
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Joined: Jan 2003
Posts: 8,142
New Mexico
UCUDANT
OP
Troll Hunter
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OP
Troll Hunter
Joined: Jan 2003
Posts: 8,142
New Mexico
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I want to verify an old 340 dampner is accurate. I have a piston stop installed and the dampner stopped at 6 degrees BTDC when rotating clockwize and at 7.5 degrees ATDC when rotating counterclockwise, I know the chain has slack backward so do I call this good. I really want to rig a dial indicator into the holetobe certain. The timing chain and gears are new
Last edited by UCUDANT; 11/08/15 08:19 PM.
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Re: Verifying TDC on a dampner (timing chain slack)
[Re: UCUDANT]
#1947682
11/08/15 08:33 PM
11/08/15 08:33 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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turn crank till the dampener slit is at 15 BTDC. install stop till it firmly contacts the piston. turn crank CCW till the piston contacts the stop. if the slit is at 15 ATDC then the slit is dead on. I would also measure how much slack the chain has & measureing that at the dist rotor will also include dist intergear/lower tang slop combined with the chain slop. Check by turning the dampener CCW carefully till the marks are at 15 BTDC (keep the chain taut in that direction) then turn the crank back CW till a helper hollers that the rotor JUST moves (use the dial indicator for that). that distance on the dampener in degrees is that total slop amt
live every 24 hour block of time like it's your last day on earth
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Re: Verifying TDC on a dampner (timing chain slack)
[Re: WILD BILL]
#1947718
11/08/15 09:19 PM
11/08/15 09:19 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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[color:#3366FF]Any slop in the timing chain would have absolutely no bearing on the damper markings to TDC. Bill is absolutely correct there (I had to delete some of my post material)/was thinking of two things at once!. You would need to start further back than 6 deg cuz you're into or close to being into the piston dwell area when you're that close to TDC
live every 24 hour block of time like it's your last day on earth
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Your looking at the dampener only, not the camshaft 
Maybe the outer ring has slipped some 
If so replace it now before it slides all the way off 
