Coolant leaking from water pump bolt 3L

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Coolant leaking from water pump bolt 3L

Postby boyscout on Wed, 27 Dec 2017 6:11 +0000

Changed Timing belt with new pump and kit as 100000 interval reached hilux is ln106 1996 model took it for a drive to check for leaks none next day started leaking after driving pulled off water pump thinking gasket as lots of coolant in case it was not coming from weep hole on water pump unfortunately did not pressure test system did not think,leak appeared again,damn this time took timing case cover off and pressure tested with borrowed tester,coolant coming from water pump mounting bolt unbolted water pump changed gasket and on bolts used Holden sealing compound for head studs on bolts ,installed pressure tester no leaks,still fine,a mechanic suggested the compound for bolt,not sure why the bolt leaked.
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Re: Coolant leaking from water pump bolt 3L

Postby martynvella on Wed, 27 Dec 2017 7:10 +0000

All that with only a few comer's makes it hard to figure out if it is a question, statement or both.
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Re: Coolant leaking from water pump bolt 3L

Postby boyscout on Wed, 27 Dec 2017 12:41 +0000

Sorry it’s a question as coolant is still leaking from bolt,not sure what to try next.
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Re: Coolant leaking from water pump bolt 3L

Postby TOYZX on Wed, 27 Dec 2017 1:04 +0000

Try putting an alloy washer under the head of the bolt. See this alot in the motorcycle industry as some engine bolts pass through oil or coolant galleries.

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Re: Coolant leaking from water pump bolt 3L

Postby boyscout on Wed, 27 Dec 2017 1:26 +0000

Thanks TOYZX for reply will keep in mind.
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Re: Coolant leaking from water pump bolt 3L

Postby Critter350 on Tue, 09 Jan 2018 12:34 +0000

If you’re taking the bolt out to put a washer under it, I’d be applying some gasket goo to the thread before it goes back in. Used to see this a little t on the old Holden’s, have come across it on the hilux but haven’t done a water pump yet either!


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Re: Coolant leaking from water pump bolt 3L

Postby boyscout on Thu, 18 Jan 2018 3:45 +0000

Critter 350
After speaking to a 4x4 engine rebuilder he said they had a similar problem years ago after replacing head gaskets,and using a green coolant ,they then ran straight water for first couple of thousand kilometres drained then added appropriate mix with coolant coloured red ,explaining the technical make up of the green coolant,of which I can’t remember now and why it runsI have since flushed and drained the coolant ,I am now running straight water the rebuilders advise was it may seal up ,well the drip has stopped fingers crossed,after a few weeks I will then put 50 percent coolant mix he also explained about Holden sealing compound 3835215 on the bolt which is similar to your suggestion.
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Re: Coolant leaking from water pump bolt 3L

Postby boyscout on Mon, 05 Mar 2018 6:44 +0000

An update
It stopped leaking with straight water I drained water and put coolant mix 50/50 red Toyota back been running a few weeks now coolant leak from timing case has stopped.
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