BJ 70 with a 3B engine is overflowing coolant reservoir

Joined
Jan 18, 2019
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Hello friends.

I'm having this problem in my Toyota 3b. I already replace the head with a rebuild one, new head gasket, flush the radiator, I did remove the thermostat and still happens the same, I already check all the hoses for a clogged hose or something but everything looks normal, and I'm out I ideas now, so ill appreciate any idea, advise or something that you guys can have and I will appreciate it a lot
 
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Sep 22, 2004
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Calgary
After dealing with that symptom on 3 different trucks, I will say with 98% certainty that you have a blown head gasket. It's only about a 4-5 hour job to change it. Be sure to use a Toyota Multi-layer steel head gasket, you will never have a problem again. The original factory and aftermarket head gaskets are junk.
 
Joined
Jan 18, 2019
Messages
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Location
Costa Rica
After dealing with that symptom on 3 different trucks, I will say with 98% certainty that you have a blown head gasket. It's only about a 4-5 hour job to change it. Be sure to use a Toyota Multi-layer steel head gasket, you will never have a problem again. The original factory and aftermarket head gaskets are junk.
Thank you, but yes i bought a new head, and i did install this same OEM Toyota multi-layer steel head gasket, but still happens the same...
 

roscoFJ73

 
 
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Does it overheat as soon as you hit the freeway or does the guage start climbing as soon as you start it?
From memory these have a dual pass radiator that sometimes collapse inside. A flush wouldnt make a difference. Becuase both hoses are on one side, the coolant is supposed to flow from one side to the other and back again to get the full cooling effect. When they collapse, the coolant is running down one side and straight to the outlet.
Its a generic pic , but you get the idea.

1926278
 
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Did the 'rebuilt head' get thoroughly inspected for cracks? I had one that had cracks that were okay, (did not open up and let coolant out) until I put a turbo on it, once turbo'd, as soon as the engine got hot, they'd open up and coolant would overflow out the reservoir.
 
Joined
Jan 18, 2019
Messages
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Does it overheat as soon as you hit the freeway or does the guage start climbing as soon as you start it?
From memory these have a dual pass radiator that sometimes collapse inside. A flush wouldnt make a difference. Becuase both hoses are on one side, the coolant is supposed to flow from one side to the other and back again to get the full cooling effect. When they collapse, the coolant is running down one side and straight to the outlet.
Its a generic pic , but you get the idea.

View attachment 1926278
roscoFJ73 Thank you, my friend. Yes, that makes a lot of sense because I've been touching the radiator on the side of the hoses gets hot, but the other side just gets a little warm. I just made the cylinder leak test and is perfect, no leaks so the theory of the radiator gets stronger. Can that cause the overflow in the coolant reservoir? And yes, the car starts to heat soon as I start the vehicle
 
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Did the 'rebuilt head' get thoroughly inspected for cracks? I had one that had cracks that were okay, (did not open up and let coolant out) until I put a turbo on it, once turbo'd, as soon as the engine got hot, they'd open up and coolant would overflow out the reservoir.
Thank you Owyhee Jackass. I didn't check the new head for cracks but it can happen everything is possible, I just warm the engine and then I did the cylinder leak test, but everything looks normal. I'll post some pictures of the old head and the new one
 
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In the first picture is the new head, the second one is the old one and the 3er picture is the radiator showing where gets hot and where gets just warm...
 
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