Water pump torque and sequence

Tiny
INTOSILENCE1
  • MEMBER
  • 1998 BUICK RIVIERA
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 141,000 MILES
I need the torque specs and correct sequence for tightening the bolts to the water pump. There are 4 thinner short bolts, and 4 thicker longer bolts. Thanks.
Sunday, November 1st, 2020 AT 12:17 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
The bolts are all tightened to 20 lb ft. Or if you have a torque angle gauge you torque them all to 11 lb ft and then tighten an additional 80 degrees. The pulley bolts are torqued to 116 inch pounds. There is no set pattern on the pump bolts but you can use a simple cross pattern if you wish, just pick a bolt as a starting point.
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Sunday, November 1st, 2020 AT 2:15 AM

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