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1998 K1500 P/U VORTEC 5.7L TIMING 180 OUT AND RUNS?

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 1998 K1500 P/U VORTEC 5.7L TIMING 180 OUT AND RUNS?

This topic contains 3 replies, has 3 voices, and was last updated by Ryan Kennedy Ryan Kennedy 11 months, 3 weeks ago.

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  • #954127
    ROBERT DITTO
    ROBERT DITTO
    Participant

    Hello all,

    I am currently rebuilding a 98 VORTEC 5.7L for my brother from another mother. As I was doing th tear down, I placed the timing mark on the harmonic balancer with the TDC mark on the block, and when I removed the distributor cap, the rotor was pointed to the #6 Cylinder, not #1. When I pulled the heads off I did notice that both the #1 Piston and #6 Piston were in a TDC configuration, when I removed the distributor from the block, to circle just below the cam gear was aligned with the white line mark on the shaft. But, again, the rotor is aimed at #6. The engine did run smoothly before this tear down. I am rebuilding it because it lost it’s rear main seal, and the a lot of the gaskets were leaking oil as well, so as a favor to him in this COVID-19 business, I am rebuilding it and all he is paying for is the parts. But for the life of me I have never know a 5.7 to be 180 degrees out and run smoothly? I do not have the timing cover off yet, and I know there has been work done on this engine in the past, is it possible the something in the crankshaft/cam shaft timing relationship is backwards or something? When I put the engine back together I should use TDC #1 Cylinder right?, I just don’t want it to throw a crank/cam correlation code after it is all build and fresh for him again.

Viewing 3 replies - 1 through 3 (of 3 total)
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  • #990105
    Chip Atchley
    Chip Atchley
    Participant

    What did you find out? I am replacing the Distributor cap and rotor on my sons 1997 5.7 and I am on the compression stroke of #1 with the crank pully line lined up with the timing mark and the rotor is pointing to #6. I am so confused. It has been running for 2 years like this. Should I pull the Distributor and rotate it around so it points to #1?

    • This reply was modified 1 year, 3 months ago by Chip Atchley Chip Atchley.
    #992172
    Ryan Kennedy
    Ryan Kennedy
    Participant

    I’m very curious what you see after taking off the timing chain cover.My truck ran perfect but I decided to do a high rev burnout from 2 to 3 gear(it has a nv3500) halfway into the burnout it feel on it’s face no high end power bad vibration anything over 2500 rpm.I thought I skipped a tooth on timing chain but when I pulled the cover it lined up perfect however my distributor was pointing at the firewall not #1 cylinder.I’m very confused as I should be not being a mechanic what so ever.

    #992173
    Ryan Kennedy
    Ryan Kennedy
    Participant
Viewing 3 replies - 1 through 3 (of 3 total)

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