Coolant Leak, Drip Coming Down Behind Crankshaft Pully

[meatloaf]

I replaced the timing belt and water pump about six months ago (7000 miles), it was fine until lately I started smelling coolant and checked in under the hood I notice a drip behind the crankshaft pulley coming from what I believe is the water pump area. I know I may need to open up the tc covers and if the leak is coming from water pump, can I reuse the same timing belt or should I order a new one?

 

[GTV]

Are you sure it’s not coming from the crossover pipe below the throttle body? Was this an Aisin TB kit?

 

[jerryb]

My coolant dripped from the bottom..
Ended up being from the smaller oring on the crossover pipe.
Point is, get everything off you can and then pressure it up to definitively find it. Rent the tool.
I was prepared to redo the belt but didn't need to. Still had to take the intake off and had the throttle hanging on a wire from the hood. Leave every coolant line attached while you pressure test it.

I had a new T belt just in case my line up lines weren't still on it. My leak happened at 10k
If was very small.
Pressure tester is one thing I don't buy and I don't know why.
Underated tool for sure.

 

[meatloaf]

Thanks @GTV & @jerryb , I will tear into it next week, I did see some coolant a little higher up on the tc cover

 

[WeCruise]

Looks like the water pump weep hole. I had coolant in that area last year and tried everything but it ended up being my water pump. Sucks because it wasn't due for another 40k or so... Grab a pressure tester for sure. If you do have to replace it, Toyota has a good march sale going on right now. Make sure you go Aisin! Good luck

 

[meatloaf]

Current Aisin water pump has ~6K miles at most

 

[2001LC]

You can reuse the timing belt. Inspect it!

 

[meatloaf]

I posted this almost a year ago and since I am replacing the radiator and doing the steering rack, I figured I’d start tracking the source of the leak, and I think I found it. Looks like the lower part of thermostat housing was not sealing correctly?

 

[nissanh]

Yeah! It's missing the FIPG.

 

[meatloaf]

I thought I had put plenty of sealer the first time around, now I wish I could put a rubber seal in there and be done with it.

 

[abuck99]

I thought I had put plenty of sealer the first time around, now I wish I could put a rubber seal in there and be done with it.

What sealer did you use? From the picture it looks like clear silicone -

 

[meatloaf]

one of the Permatex sealants, can’t remember which one though

 

[abuck99]

one of the Permatex sealants, can’t remember which one though

What ever it was doesn’t look like it was the right choice.

Try snd clean all that RTV off and use correct FIPG- Aisin makes an option AB1207B1 or get the Toyota FIPG - for the 04-07+ which calls for Toyota 1282B and is compatible with SLLC2 coolant (factory fill). If you dont want to spend $80 for a tube of that stuff, most Toyota dealerships just use the Toyota FIPG 103- and if you use that be sure and let it completely dry for at least 24hrs before adding any coolant and starting engine. That’s the trade off to save $70 on FIPG.

 

[cwwfj60]

I thought I had put plenty of sealer the first time around, now I wish I could put a rubber seal in there and be done with it.

Permatex ultra grey is my go-to in this situation

 

[meatloaf]

Permatex ultra grey is my go-to in this situation

Thanks Cody!

 

[meatloaf]

What sealer did you use? From the picture it looks like clear silicone -

I used permatex anaerobic, plus the permatex surface prep per @scottm ”Timing Belt For Dummies” thread, I guess this dummy did not prep correctly so posting so that I can maybe spare someone from making the same mistake I made.

 

[abuck99]

Not to harp on following FSM recommendations but for water pump and critical sealing components Toyota FIPG really is the good stuff (made by Three Bond).

Permatex makes a water pump and thermostat housing coolant resistant sealant- #22071 Id prob use that as a second option.

In the FSM it illustrates the bead thickness and height to lay onto that housing- it’s important to follow that guidance- too much it will squeeze into the water passages, too little and it won’t seal right.

Good luck

 

[meatloaf]

Not to harp on following FSM recommendations but for water pump and critical sealing components Toyota FIPG really is the good stuff (made by Three Bond).

Permatex makes a water pump and thermostat housing coolant resistant sealant- #22071 Id prob use that as a second option.

In the FSM it illustrates the bead thickness and height to lay onto that housing- it’s important to follow that guidance- too much it will squeeze into the water passages, too little and it won’t seal right.

Good luck

@abuck99 , I really appreciate you sharing this info and your knowledge! I need all the help and advice I can get.