Jumped Time Symptoms
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Junior User
Joined: Sep 2010
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From: Portland
Jumped Time Symptoms
84 F-250 - 351CI/5.8L - 4 Spd - Motocraft 2150 carb - Duraspark II
Yeah I am back.. A new thread for the same problem
Gave up on messing with the distributor.. I am thinking this truck has jumped time..
Can anyone give me symptoms or tests to diagnose whether an engine has jumped time?
Yeah I am back.. A new thread for the same problem
Gave up on messing with the distributor.. I am thinking this truck has jumped time..
Can anyone give me symptoms or tests to diagnose whether an engine has jumped time?
Posting Guru
Joined: Apr 2011
Posts: 1,636
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From: Orlando area
Maybe start by rotating engine around until the timing pointer is at 10 degrees BTDC (or whatever you set your timing to) and see if the rotor is pointing right at the number the one plug wire terminal. Give or take a few degrees. If your 10 or more degrees off something is wrong.
Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
I would put #1 at TDC of the compression stroke, the pointer on the balancer should point to 0.
The balancers are made of two pieces with rubber holding them together, that rubber deteriorates and the two pieces slip so maybe that's your problem, instead.
The balancers are made of two pieces with rubber holding them together, that rubber deteriorates and the two pieces slip so maybe that's your problem, instead.
Posting Guru
Joined: Apr 2011
Posts: 1,636
Likes: 5
From: Orlando area
That's a good idea to see if the damper has failed/slipped, but keep in mind that if the timing chain jumped a tooth (or is stretched considerably), the crankshaft damper will still point to 0 with piston at TDC - it's the cam (valve events and distributor timing) that are out of sync in that scenario.
Moderator
Joined: Jan 2001
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From: Virginia
If the timing chain has jumped, it's been my experience it will not run, and when cranking it cranks strangely. By that I mean it doesn't have a steady rhythm. It will speed up and slow down in a strange pattern as it's cranking.
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