PZJ Cooling System
- Thread starter decoco
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I dont believe an upgrade is necessary, the factory pump works well in the harshest of conditions. Usually the pumps start leaking at 250000-300000klms, Ive had 2 go around then and seen a few others as well. It usually leaks from the weep hole on the pump shaft. This is a type of warning that your pump has a problem. It will keep doing its job for a while, but the bush is worn and is allowing some coolant to escape.
The aftermarkets pump metal rotors have improved in quality but the I think the plastic rotors in the OEM pump look more efficient.
I also prefer the OEM crush gasket over the aftermarket paper gasket, the latter is an awful thing to position with sealant on your fingers and with the engine in the engine bay.
Torque all the bolts properly and use good quality sealant on the alloy bits.
I would add the timing belt kit as well ,unless its been done recently. I always do the cam o ring seal as well. Probably a fan and aircon belt kit as well. A new radiator cap is always good.
The aftermarkets pump metal rotors have improved in quality but the I think the plastic rotors in the OEM pump look more efficient.
I also prefer the OEM crush gasket over the aftermarket paper gasket, the latter is an awful thing to position with sealant on your fingers and with the engine in the engine bay.
Torque all the bolts properly and use good quality sealant on the alloy bits.
I would add the timing belt kit as well ,unless its been done recently. I always do the cam o ring seal as well. Probably a fan and aircon belt kit as well. A new radiator cap is always good.
- Thread starter
- #4
timing belt was done
hmmm interesting... timing belt is due in 30,000 km which at the pace this truck gets driven is 2-3 years.
nice to have it all done now though
I would also put a new thermostat in and install a mechanical water temp gauge while your there. Also a faulty fan clutch can cause overheating and depending on which clutch you have they can be disassembled, retimed and changed to a heavier silicone oil to increase airflow.
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You don't say where it is dripping from.
Add upper and lower water outlets to your list. They are often corroded.
I have rebuilt the entire cooling system in my 1PZ, it works like a champ and gives me zero issues.
Cheers
Add upper and lower water outlets to your list. They are often corroded.
I have rebuilt the entire cooling system in my 1PZ, it works like a champ and gives me zero issues.
Cheers
- Thread starter
- #7
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- Thread starter
- #8
yes exactly, this issue of mine was not a pzj issue; the pz is just as reliable as the hz as far as I am concerned.... I do not want to give the engine a bad representation for an aftermarket item that could have been installed on a 1Hz, an Fz, a 1Bt, etc.
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Can you see the weep hole in the water pump? Its that small hole in the middle of the pump. It maybe have a channel to bring the coolant further forward. If they are leaking there is always a drop of coolant around the hole. To make sure wipe it clean and check it after a drive.
Thats miles away from the water pump
- Thread starter
- #12
Yup, as I said knucklehead.
I was following the leak with my hand while laying on the ground and it seemed like to me it could be by the pump by where it was pooling. Inexperience and not wanting to realise the plug was not done correctly probably led me that way too.
I never turned it on, so really no adverse effects there.
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Having been down this road. I did everything humanly possible to reduce overheating.
1) Replace your radiator cap.
2) Have your radiator checked
3) The thermostat should also be replaced.
4) Clutch fan.
5) Head gasket
6) Cracked head
My LJ73 suffered from a bad clutch fan causing a blown head gasket.
1) Replace your radiator cap.
2) Have your radiator checked
3) The thermostat should also be replaced.
4) Clutch fan.
5) Head gasket
6) Cracked head
My LJ73 suffered from a bad clutch fan causing a blown head gasket.
- Thread starter
- #14
Thanks for your advice, In the interest of Preventive Maintenance I have many of those items listed on the to do list project in the following month.
My issue came from from an aftermarket Inline Heater the previous owner installed. These are installed so you can plug in your car in cold weather, circulates the anti freeze and warms it up. The unit is a non toyota-aftermarket unit (not sure if Toyota ever came with them), seeing how the unit shorted, and damaged a hose which created the initial leak I decided to scrap the work of the previous owner, and re-hose the entire cooling system, and delete the inline heating system. \We've chosen to repair this the right away.
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