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#1
IP: 66.117.106.129
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How tight should the water pump be attached?
Ahoy!
I am replacing the ancient sherwood water pump with a MMI water pump. How tight should the bolts be that attach the pump to the engine? The old bolts were not very tight at all. But, I also strongly suspected the water pump was leaking oil. (Something in that area definitely is). Initially I assumed it was due to the internal oil seal failing and leaking out of the weep hole. But now I am also considering the possibility that it was just not bolted on tight enough. I do have a torque wrench -- but it is probably too big to fit in the work area. Also, does it matter which way the gasket faces? One side has writing, the other side does not. In case it is not obvious, I am new to engine repair |
#2
IP: 98.165.207.17
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They should be tight. Use your calibrated elbow, tighten until tight, then go 1/8th turn more.
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Jim Zeller 1982 Catalina 30 Kelleys Island, Ohio |
#3
IP: 72.194.219.196
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Tighten both bolts evenly in progressive stages. Do not tighten one bolt max then tighten the other bolt max. Tighten them alternately and in evenly steps to max torque.This could have been the original problem that caused one bolt to be looser than the other.
Be sure you have a correct gasket - one that can withstand oil. What do the pump and accessory drive mating surfaces look like? Are they parallel? Be sure the threads on the bolts and the accessory drive are not a.....screwed up. While you have the pump off be sure the bolts twist in far enough and easy to secure the pump. Maybe the loose bolt cross threaded bit? TRUE GRIT |
#4
IP: 107.77.97.120
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I don't recall what the thread size is for those water pump bolts, but I would not exceed these specs.:
GRADE 5 Coarse Thread 5/16-18 - 13 ft lbs. 3/8-16 - 23 ft lbs. 7/16-14 - 37 ft lbs.
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Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1 "Since when is napping doing nothing?" |
#5
IP: 24.152.132.140
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The water pump mounting bolts are 3/8"-16. Lat's spec is right in the neighborhood of what I was guessing (25 ft-lbs.).
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#6
IP: 99.30.185.198
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And one last bit of installation instructions, "do not use split lock washers on those bolts". If you do, oil will follow the thread gaps and leak out through the slot.
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