Help, I can't beat the heat!!!! 1977 BJ40

[fjfjfj]

Hello guys, Need some advice from you Guru's. Have changed out HEAD GASKET, THERMOSTAT, WATER PUMP. My 1977 BJ40 ( stock B diesel ) is still getting too hot at climbing and uphill freeway speeds. Way to hot. I will be checking out the RADIATOR FLOW but hard to believe that might be it. Rad seems in good shape. Question since I do not know enough about B, 2B and 3B diesels. What else can cause this motor to get hot at Climb or Uphill Freeway speeds? No smoking, Compression over 420 and even, idles perfect, does not overheat at slower, around town speeds. Thanks for some info.

 

[77cruiser77]

Flush that radiator. After all it's the one responsible for cooling your engine.

How many KMs? Might be worth getting your engine coolant flushed out while you're at it.

After that use Toyota Red coolant and mix it with distilled water to the recommended ratio for your climate.

A BJ40 isn't really happy with modern highway speeds, let alone on hills. What RPMs are you holding this thing at on said hills?

 

[gerg]

Post up a pic of the pump timing stamps on the side of your injection pump. I run my pump retarded but I remember a guy last year in Vegas that had major power loss and overheating because his pump had been signifigantly advanced.
g

 

[FF LC FREAK]

What are your EGTs while "climbing and uphill freeway speeds?" If your fuel is turned up, you can easily reach high EGTs, which in turn will heat up your coolant pretty fast.

 

[john thompson]

Hello All. I just have a related question and hope I'm using the forum correctly. I want to replace the thermostat in my 1980 BJ with the stock B engine. I can't seem to find one in the US, even on specter off-road. Any suggestions? Thanks

 

[Eurasiaoverland]

Toyota 90916-03045 (9091603045) THERMOSTAT

Toyota 90916-03045 (9091603045) THERMOSTAT. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.

www.amayama.com

 

[john thompson]

Toyota 90916-03045 (9091603045) THERMOSTAT

Toyota 90916-03045 (9091603045) THERMOSTAT. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.

www.amayama.com

Thank you!

 

[Silveredition]

What are your actual temps of coolant and egt?

 

[john thompson]

I wish I was a little more technical but I'm just a weekend mechanic. I've had the BJ for 15 years. About 12 years ago I added power steering and had to switch to an electric fan to make space. I kept the stock radiator. I mostly drive the car on backroads or residential streets for short trips. Over the past several years, these trips are cut off early because the temp gauge pegs on H. The only way to cool it down is to let the engine idle. I've had the radiator flushed but it didn't help. My 16yo son wants us to do a project together, so I ordered an aluminum radiator, a hose kit, and a new electric fan. I just ordered the thermostat and gasket from the site you recommended (thanks again). We're just waiting on all the parts to arrive and can hopefully start in the next few weeks. It's a big project for us, but the BJ is a weekend warrior these days so time won't be an issue. And we have YouTube technical assistance to help

 

[mudgudgeon]

@john thompson
Does the electric fan have a full shroud so air HAS TO come through the fan?
Is the shroud sealed to the radiator around the perimeter with some closed cell foam or similar?

 

[jim land]

Stock 4 row rad perform better than aluminum

 

[john thompson]

Stock 4 row rad perform better than aluminum

I'm just worried about the age of my current stock one, and a new oem is so pricey. I'm going to do the thermostat first. Maybe that solves it...fingers crossed

 

[john thompson]

@john thompson
Does the electric fan have a full shroud so air HAS TO come through the fan?
Is the shroud sealed to the radiator around the perimeter with some closed cell foam or similar?

It does have the original shroud in place, but it is NOT sealed to the radiator. I'll give that a try while we're waiting on parts. Thank you!

 

[mudgudgeon]

It does have the original shroud in place, but it is NOT sealed to the radiator. I'll give that a try while we're waiting on parts. Thank you!

Is the fan a close fit to the shroud?

If there's a large gap between the end of the blades and the edge of theskhroud, you could potentially be losing a lot of efficiency

 

[TheBussman]

I wish I was a little more technical but I'm just a weekend mechanic. I've had the BJ for 15 years. About 12 years ago I added power steering and had to switch to an electric fan to make space. I kept the stock radiator. I mostly drive the car on backroads or residential streets for short trips. Over the past several years, these trips are cut off early because the temp gauge pegs on H. The only way to cool it down is to let the engine idle. I've had the radiator flushed but it didn't help. My 16yo son wants us to do a project together, so I ordered an aluminum radiator, a hose kit, and a new electric fan. I just ordered the thermostat and gasket from the site you recommended (thanks again). We're just waiting on all the parts to arrive and can hopefully start in the next few weeks. It's a big project for us, but the BJ is a weekend warrior these days so time won't be an issue. And we have YouTube technical assistance to help

There are many different electric fans out there and most of the aftermarket universal ones have very little flow. the factory mech fan moves alot of air if the clutch is in good shape. I would try to find a way to modify the shroud, or use spacers to make the stock fan work.