carb causing overheating?

[T-bones 60]

I used the search but could not find a definitive answer on this.

Climbing hills I run over 3/4 on the stock temp guage with a bone stock 2F. On level ground at freeway speeds I am at 2/3. The radiator is newer, fan clutch is a brand new OEM Toyota ($200, ouch!), themostat is brand new along with coolant. I am starting to suspect the guage but I know I need a new carb as mine is original w/ 250+ K miles. If I spay the side of the carb it will cause the engine to stumble. George from Valley Hybrids in Stockton CA is installing a rebuilt one for me next week. (Supper nice knowledgable Cruiser guy I might add!) Do you guys think the old leaky stock carb can cause it to run hot?

Thank You for your thoughts!

 

[T-bones 60]

Forgot to mention the H20 pump is old but deos not leak and when I put the fan clutch on the pulley had no play or wobbles.

 

[John Smith]

Install a real mechanical temp gauge so you actually know how hot you are running.

 

[2mbb]

I purchased a radiator cap from Mr. Gasket, I think, that had a temperature gauge build in. This is not as accurate as a real gauge installed into the block, but it is a whole lot easier to install.

I assume you have made sure that your radiator is full and all the air is burped out of the system? Air can get trapped at the back of the head near the OEM temperature sensor, causing high measured temperatures. Also make sure your overflow tank is working properly. if the tubes are set up wrong, or these is a leak in the tube that connects the overflow tank to the radiator, water will get pushed out to the overflow tank, but not get sucked back into the radiator, causing your radiator to be low on coolant.

 

[FJ40Jim]

No, the carb cannot cause overheating. A mixture that is lean will put slightly more heat into the coolant, but the stock cooling system has plenty of excess capacity to absorb that minor increase.

Coolant that is overheating is simply not shedding enough heat to atmosphere. A restricted radiator is the most likely cause.

 

[T-bones 60]

Thank You FJ40Jim, and others who responded. I will look into an aftermarket guage. It seems to run fine with no loss of power when the guage is reading high. I also suspect the guage because when I first start it, the stock guage already registers a touch above cold when the engine has only run for a few seconds. And after driving it for an hour or so the temp will begin to read more normal.

 

[Finnyfam60]

Georg is a very standup guy who knows his stuff!

 

[Elbert]

get Georg to setup a mechanical gauge for you while at his shop. as noted above...it would be good to know what temp the truck is actually running. You should discuss with Georg while at his place I'm sure he can run down the issue or let you know something.

 

[Pin_Head]

A lean carb can increase combustion temperature, but that does not necessarily mean more heat for the radiator to deal with.

Listen up to Georg and when he tells you something, you say "Ja genau, Herr Oberst".

 

[T-bones 60]

I plan on asking george about a guage for sure! However I did notice that due to my seeping valve cover gasket (George is adjusting the valves for me too so that should get fixed) that my temp sender was covered in oil. I sprayed the heck out of it w/ brake cleaner. I'm wondering if that could be responsible for inacurate readings too? I guess I'll find out on my hour drive to Stockton next week.

 

[Spike Strip]

Are you sure it's over-heating ? Use an infrared thermometer (Harbor Freight) to take readings on the radiator/head/hoses .... Gauge is notoriously inaccurate.

 

[T-bones 60]

Are you sure it's over-heating ? Use an infrared thermometer (Harbor Freight) to take readings on the radiator/head/hoses .... Gauge is notoriously inaccurate.

No I'm not sure, thats the problem! LOL I will most likely install an aftermarket guage as the factory guages don't tell ya much. I am a guage watcher and I would like to know the actual temp.

 

[GAS-A-LOT!]

Holy thread revival batman!!!


I'm in that situation as well. Were u able to find out the problem?