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The timing marks on the crank/CAM sprokets are they to be lined up at number four TDC or #1 TDC.

Tiny
TYNTHEKY
  • MEMBER
  • 1995 GMC JIMMY
  • 148,000 MILES
The haynes manual says to set at number four cylinder TDC to line up the timing marks on the sprockets. Because I know it did not line up and that the haynes manual is wrong most the time, I have to ask. This is a 95 gmc jimmy 2dr 2wd. 4.3 vortec vin W.I have looked for at least ten hours on the computer and still do not have a answer. The dealer cannot help assuming a liability issue. Thank you.
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Wednesday, November 30th, 2011 AT 4:24 PM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
#1 TDC. See image.
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Wednesday, November 30th, 2011 AT 5:33 PM
Tiny
TYNTHEKY
  • MEMBER
  • 2 POSTS
The haynes manual and auto-zones computer both say number four, chlton is made by the same company I believe. Thank you. I will never understand why simple information is so hard to find.
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Wednesday, November 30th, 2011 AT 6:33 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Timing is NEVER done on cylinder #4. ALWAYS #1.
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Thursday, December 1st, 2011 AT 3:18 AM

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