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Old 06-29-2010, 12:11 AM   #1
eburrows
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Default Water pump bolt thread sealant

I've removed, re-doped and replaced the two long bolts on the left-hand-side of my D2's water pump twice now. Both times using Permatex thread sealant. Both times, after a while, it starts leaking.

The leak isn't bad, but it's causing the bolt to start to corrode.

So! What thread sealant out there is the best?

Further: Who's stupid idea was it to use non-tapered threads into the pressurized coolant system?!

I'm thinking about using my "Perfect Seal" from Mercruiser...
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Old 06-29-2010, 12:21 AM   #2
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Default Re: Water pump bolt thread sealant

[quote=eburrows]
Further: Who's stupid idea was it to use non-tapered threads into the pressurized coolant system?!

quote]

That was my idea.
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Old 06-29-2010, 07:04 AM   #3
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Default Re: Water pump bolt thread sealant

I always use Permatex thread sealant. Just cover the whole bolt, not just the threads.
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Old 06-29-2010, 12:23 PM   #4
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Default Re: Water pump bolt thread sealant

I've used blue rtv silicone with no problems.
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Old 06-29-2010, 08:14 PM   #5
LANDROVER LUKE
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Default Re: Water pump bolt thread sealant

how old is the timing cover gasket??these are just a thin paper gasket and tend to crack and push outward near these bolts ..i would consider replacing the timing cover gasket water pump gasket --and i would use an anerobic sealant instead of rtv---this area needs a sealant that dries without air
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Old 06-29-2010, 10:03 PM   #6
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Default Re: Water pump bolt thread sealant

The timer cover hasn't been removed/replaced for probably more than 130,000 miles. However, it isn't leaking oil, just coolant... Though I am a little fuzzy on how all those pieces line up in that area.
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Old 06-30-2010, 08:48 AM   #7
LANDROVER LUKE
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Default Re: Water pump bolt thread sealant

Quote:
Originally Posted by eburrows
The timer cover hasn't been removed/replaced for probably more than 130,000 miles. However, it isn't leaking oil, just coolant... Though I am a little fuzzy on how all those pieces line up in that area.
besides headgasket repairs on these trucks the next common repair i do is the timing cover gasket job--simply over torqueing the bolts for the cover will cause a leak--they have a very light torque spec
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Old 06-30-2010, 09:12 AM   #8
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Default Re: Water pump bolt thread sealant

Quote:
Originally Posted by LANDROVER LUKE
besides headgasket repairs on these trucks the next common repair i do is the timing cover gasket job--simply over torqueing the bolts for the cover will cause a leak--they have a very light torque spec
How about when doing a water pump? Is there a notable risk that the timing cover gasket seal will be compromised when tightening the water pump bolts? It looks like 2 or 3 go straight through the timing cover from what remember seeing last night.
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Old 06-30-2010, 10:06 AM   #9
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Default Re: Water pump bolt thread sealant

Ultra blue is the best for this for a number of reasons.

it is the best sealent for locations that are still contaminated with coolent or oil.

plus it also never fully hardens so it wont seal those bolts in and cause them to break when you try to remove them in the future.

permatex ultra blue...its the ticket!!
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Old 06-30-2010, 03:12 PM   #10
eburrows
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Default Re: Water pump bolt thread sealant

Well, I'd rather try a sealant or two before pulling the timing cover, so I suppose I'll try Permatex blue first. Thanks!
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Old 06-30-2010, 08:01 PM   #11
LANDROVER LUKE
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Default Re: Water pump bolt thread sealant

Quote:
Originally Posted by dcarr1971
How about when doing a water pump? Is there a notable risk that the timing cover gasket seal will be compromised when tightening the water pump bolts? It looks like 2 or 3 go straight through the timing cover from what remember seeing last night.
yes there is always that risk when disturbing these bolts but 95% of the time the gasket remains intact--i do still apply some kind of anerobic sealant(LR snot sealant) to the threads and torque to spec
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