Coolant Leak 1HZ Troopy

[lorndogga]

Hey legends!
I’ve been chasing a coolant leak for a while now and need some help.

- Losing alot coolant (have to fill up every 2-3 days)
- Leaking right near oil sump and directly under starter motor (for reference)
- Intermittent: only happens ‘sometimes’ i.e the leak will randomly appear some days
- No apparent leak marks near front of engine (radiator, hoses etc.) and hoses seem in good condition

Hopefully someone can help!
Cheers

 

[WarDamnEagle]

I know nothing about a 1HZ but I see a relief valve on the oil cooler that could be an intermittent source. Just a guess.

 

[lorndogga]

I know nothing about a 1HZ but I see a relief valve on the oil cooler that could be an intermittent source. Just a guess.

Cheers for your reply, I’ll have a look into it

 

[Squash]

Does it leak while idling?
If you answer no then rev her up and hold the revs for a while so that the water pump gets everything moving. Betting its a hose which only leaks at high rpm.
The hose from this location is 5/8" and easy to source if you cannot get a Toyota part.
If you need to add custom bends you can always purchase spring wound hose adapters. I just did this to my HDJ81 which has the identical hose to your 1hz.

 

[Squash]

Pic of springy things!
These are moldable. Other models are available, or insert into a larger piece of hose.

 

[lorndogga]

Does it leak while idling?
If you answer no then rev her up and hold the revs for a while so that the water pump gets everything moving. Betting its a hose which only leaks at high rpm.
The hose from this location is 5/8" and easy to source if you cannot get a Toyota part.
If you need to add custom bends you can always purchase spring wound hose adapters. I just did this to my HDJ81 which has the identical hose to your 1hz.

Thats a good call! She’ll leak after a good drive following high rpms once engine is shut off but will test that theory tomorrow. Which hose did you replace and where was it?

 

[lorndogga]

Thats a good call! She’ll leak after a good drive following high rpms once engine is shut off but will test that theory tomorrow. Which hose did you replace and where was it?

Just saw the photo. Cheers!

 

[lorndogga]

Found my leak rather quickly! Coming from RHS heater hose. Hopefully this helps someone in the future!