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Pete
Dodge Dakota
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5/23/2005
08:55:17
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 Subject: Crank Sensor and timing
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Message:
I have a 97 CC, 3.9L with ~90K miles. I am thinking my timing chain is loose, but am hesitant to tear it all down until I know that's the problem. If I have a loose chain, the timing should be retarded, correct? If I do the crank sensor mod to advance the timing, and it runs much smoother, that should be a pretty good indicator that I should replace the timing chain? Let me know your thoughts. Thanks.
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Dan M
Dodge Dakota
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5/23/2005
21:14:15
| RE: Crank Sensor and timing
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Grab the fan support rod and rock it back and fourth, if it gives alot you need a new timing chain.. That's a trick someone showed me late last year.
- Dan M
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Peter
Dodge Dakota
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5/24/2005
13:34:38
| RE: Crank Sensor and timing
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I imagine the fan support rod is connected to the actual fan? Do you mean to rock it in and out, or side to side? Thanks.
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N56629
Dodge Dakota
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5/24/2005
16:25:14
| RE: Crank Sensor and timing
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"Grab the fan support rod and rock it back and fourth, if it gives alot you need a new timing chain.. "
If the fan shaft move back and forth you may need a water pump not a timing chain.
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Dan M
Dodge Dakota
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5/24/2005
16:40:13
| RE: Crank Sensor and timing
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he told me to grab a wrench, put it on the fan support going into the block and rotate it left and right. if it has alot of play, the timing chain needs replaced.
- Dan M
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another mark
Dodge Dakota
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5/24/2005
18:13:27
| RE: Crank Sensor and timing
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I'd like to think this is a great trick for checking this but I don't understand this method.
The timing chain rides on two sprocketed wheels, one attached to the crankshaft, the other to the camshaft. Just how does shaking the fan which attaches to the water pump (which in turn does not attach to anything else but the engine block) going to do anything for you?
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Bob Lincoln
Dodge Dakota
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5/24/2005
20:51:05
| RE: Crank Sensor and timing
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Dan M is mistaken, it's supposed to be the crank pulley. A better way is to take the distributor cap off and start to turn the crank by hand, and see if the distributor rotates immediately. The more the lag, the more slack there is.
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Jake
Dodge Dakota
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5/24/2005
21:04:30
| RE: Crank Sensor and timing
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Message:
Pete, if the chain jumped, first it will be very hard to start and when it is running you'll have next to zero power. A quick way to tell it to bring the engine up to TDC( compression stroke),remove the distributor cap and look where the rotor is in relation to no 1 plug wire. Since the cam drives the distributor on a one to one basis, the rotor should be right at #1 wire. If not you have about a 4-5 hour job replacing the chain.
Dan M, you don't work on many motors do you?
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Pete
Dodge Dakota
JOIN HERE
5/25/2005
14:12:50
| RE: Crank Sensor and timing
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Thanks guys, I appreciate the help.
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