| non-GMC engine question [message #266763] |
Tue, 25 November 2014 23:27  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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OK all you engine rebuild gurus, and especially Colonel Ken, I have a question.
Today I changed the thermostat and oil in my Atlas I-5 3.5 liter engine in my 2005 Chevy Colorado. When changing oil and filter I always start the engine, see that the pressure comes up on the gauge and then look at the filter to make sure it is not leaking. This time I was under the front of the Colorado and Laurie happened to be nearby. So I said to her "please start the engine and verify the oil pressure comes up. I remained on the floor looking up at the filter. When she started the engine, the crank pulley moved to the rear about a 1/4 inch during cranking and immediately returned forward on start up. I had her do this start / run / shut down sequence 4 or 5 more times and the pulley did the same thing every time. (1/4" back during cranking and return 1/4" forward while running.)
I then took a screwdriver and tried moving the pulley (and crank) by hand and it easily moves forward and backwards without the engine running. The pulley retaining bolt is tight to the crankshaft.
I have never seen this before.
I have no engine running, oil consumption, oil pressure, or oil leak complaints.
Is this something normal?
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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