Water Pump Replacement Questions - Toyota Nation Forum : Toyota Car and Truck Forums
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post #1 of 5 Old 04-20-2019, 06:36 PM Thread Starter
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Water Pump Replacement Questions

Hi Folks,

Been awhile since I changed out a water pump (1974 Ford Mustang)

I have a Toyota Truck 1986 SR5 4WD
My toyota shop manual states nothing about adding any
sealant to the gasket, nor does it talk about the torque on
the water pump bolts

Anyone know the torque specs and have any experience with adding a sealant to the
gasket or just installing the gasket dry ?

Thanks for the Assist
Jim
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post #2 of 5 Old 04-20-2019, 10:46 PM
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From what I've read, it's about 13 ft lbs, but some people have reported that the bolts snapped (broke) using that spec and that just making them snug is good enough. Do not over tighten the bolts! You will be very upset if you break the bolts, so go easy.

Normally you don't need the sealant as long as the mating surfaces are very clean/smooth (not scratched up). You can use sealant if you want, though, as it seems to be popular with most people. Use a very thin layer, since you don't want that stuff mixing into the coolant. Two videos I saw both used sealant with the gasket. If the mating surfaces are smooth, I'd personally not use any sealant (as I already mentioned). You decide.

I highly recommend you use an Aisin waterpump. I believe the part number is WPT-007.

It makes sense to me to do the two bolts in the middle first, then the outside bolts in a criss-cross pattern. One video I saw said to do the outer bolts first, then the two inner bolts and to put black sealant on the bigger of the two bolts. I still think it makes sense to snug the two inside bolts first, but that's just me. Perhaps get all the bolts in there to make sure everything is lined up, then snug the inside bolts, then the outer bolts.

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Last edited by John Anthony; 04-20-2019 at 10:51 PM.
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post #3 of 5 Old 04-21-2019, 12:18 AM Thread Starter
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Hi John

Thanks for all the info you provided. I have that Aisin water pump, but I do not like the way it was moulded. Lots of what look like hairline, not cracks, but they look like veins in the moulding process.

Anyway thanks again

Jim
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post #4 of 5 Old 04-22-2019, 07:45 AM
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Quote:
Originally Posted by Samson3113 View Post
Hi John

I have that Aisin water pump, but I do not like the way it was moulded. Lots of what look like hairline, not cracks, but they look like veins in the moulding process.
Jim
Hmmm.......I've never had a bad Aisin product ever. Can you provide a photo of that issue? Can you have it exchanged?

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post #5 of 5 Old 04-23-2019, 11:50 PM Thread Starter
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Hi John

bought the water pump over a year ago and did not use it. Contacted Aisin and they said it was the mould that causes the lines. I did not instal it at the time and still have it. Aisin would not refund nor replace. Bought through Amazon. Here are a few pictures. Hope they are not too blurred. Was only able to upload 5 due to limit, but I think you can see what I am talking about

Thanks
Jim
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