SB overheating
- CanuckHoss
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SB overheating
Have a Canadian customer and friend in Arizona on his new to him 2001 Sb coupe trike and is having issues overheating.
Is fine on the highway but in town / stop and go traffic it boils over.
Rad is full...fluid looks ok.
Water Pump seems to be running fine.
Fan is running as it should.
Tried a new rad cap with no difference.
Has no thermostat which lots and lots of SB and BB have done without issue.
Makes no sense as everything seems to be working like it should.
Any thoughts???
Is fine on the highway but in town / stop and go traffic it boils over.
Rad is full...fluid looks ok.
Water Pump seems to be running fine.
Fan is running as it should.
Tried a new rad cap with no difference.
Has no thermostat which lots and lots of SB and BB have done without issue.
Makes no sense as everything seems to be working like it should.
Any thoughts???
CanuckHoss
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Re: SB overheating
Have him find a Merc Cruiser Boat engine dealer.
Then buy a 152 degree Merc Cruiser thermostat.
It's for a SB Chevy engine.
Paul H
Then buy a 152 degree Merc Cruiser thermostat.
It's for a SB Chevy engine.
Paul H
Re: SB overheating
That is a strange one!
Just some ideas:
Is it truly running hot, or is it just venting fluid via the radiator cap overflow? What is the temperature gauge showing?
Does it have a overflow/recovery tank?
A couple of times, I have had the switch that turns the fan on and off get flakey.
May not be getting proper airflow. Are the fins behind the radiator fan dirty?
Just some ideas:
Is it truly running hot, or is it just venting fluid via the radiator cap overflow? What is the temperature gauge showing?
Does it have a overflow/recovery tank?
A couple of times, I have had the switch that turns the fan on and off get flakey.
May not be getting proper airflow. Are the fins behind the radiator fan dirty?
Regards,
Mark
Mark
Re: SB overheating
I’d bet that it’s fan or radiator related. Highway speeds are enough to keep air flowing over the radiator.
It’s new to him, has it been that way since he got it? Did someone wire the fan backwards? He should verify air flow over the radiator.
It’s new to him, has it been that way since he got it? Did someone wire the fan backwards? He should verify air flow over the radiator.
1998 Wild One Custom - Homebuilt
- CanuckHoss
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Re: SB overheating
After our conversation today I mentioned to him about him possibly having installed/wired the new fan I supplied backwards...have not heard back from him yet...possibilityJack wrote:I’d bet that it’s fan or radiator related. Highway speeds are enough to keep air flowing over the radiator.
It’s new to him, has it been that way since he got it? Did someone wire the fan backwards? He should verify air flow over the radiator.
He never rode it here in Canada after purchase in December due to you know..Ol' Man Winter in Saskatchewan...trailered it to Arizona and now the problem.
Last edited by CanuckHoss on Mon Jan 28, 2019 6:13 pm, edited 1 time in total.
CanuckHoss
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
- CanuckHoss
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Re: SB overheating
No overflow tank...gauge is working properly he assumes. FAn is running when it should.mmaupin wrote:That is a strange one!
Just some ideas:
Is it truly running hot, or is it just venting fluid via the radiator cap overflow? What is the temperature gauge showing?
Does it have a overflow/recovery tank?
A couple of times, I have had the switch that turns the fan on and off get flakey.
May not be getting proper airflow. Are the fins behind the radiator fan dirty?
I asked him to do a test in the morning when air is cooler. Start trike let it warm to fan coming on and make sure the fan cools it just sitting there idling and fan shuts off.
CanuckHoss
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Re: SB overheating
Did you pull a line off to check the water pump flow? A backwards fan may do it, but whether its pushing or pulling air shouldn't matter much.
- Orlando606VetteTrike
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Re: SB overheating
When i reassembled my BB after the refresh, i noticed my temps were much higher than before. So after some looking around i noticed my hose from the pump to the manifold was kinked. Straightened it out, and now normal temps. Worth a look.
2008 606 Corvette Trike
- knockdolian
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- Location: Yeovil Somerset UK
Re: SB overheating
Sorry, have to disagree with that. Pulling hot air through the radiator will be a lot less effective than pulling cold air through. Although Arizona is a bit warm I believe !! So maybe it the same there ?Foose1986 wrote:Did you pull a line off to check the water pump flow? A backwards fan may do it, but whether its pushing or pulling air shouldn't matter much.
He really needs an expansion tank as the coolant will expand and come out the cap. That leaves you short of coolant for the next ride. That’s how I see it anyway. Had the same issue in the Uk until I fitted an expansion tank
- CanuckHoss
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Re: SB overheating
Actually it does matter as I found out quite a few years ago.Foose1986 wrote:Did you pull a line off to check the water pump flow? A backwards fan may do it, but whether its pushing or pulling air shouldn't matter much.
On the other Forum someone shared the wiring to make the fan run in reverse when you were in really slow traffic to have it pull air away from you rather than push. It did not cool anywhere near what it did when it was running in the right direction / pushing air..so I never used it much at all.
CanuckHoss
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Re: SB overheating
Interesting. In my past experiences it didn't matter, and you had the option of push/suck. But these were larger diesel motors. Must come down to CFM of the fan itself.CanuckHoss wrote:Actually it does matter as I found out quite a few years ago.Foose1986 wrote:Did you pull a line off to check the water pump flow? A backwards fan may do it, but whether its pushing or pulling air shouldn't matter much.
On the other Forum someone shared the wiring to make the fan run in reverse when you were in really slow traffic to have it pull air away from you rather than push. It did not cool anywhere near what it did when it was running in the right direction / pushing air..so I never used it much at all.
- CanuckHoss
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Re: SB overheating
WELL WELL WELL!!!
My initial question to him was about the new fan he put on as the chrome on the old was peeling....question was "is the fan running the right direction?" He thought for sure it was.
He called a bit ago to say when he fired it up this morning and waited for the fan to cut in it was indeed running in the WRONG direction and pulling air. He changed the wiring and went riding and no issues...
All is WELL and thank you everyone for your suggestions.
My initial question to him was about the new fan he put on as the chrome on the old was peeling....question was "is the fan running the right direction?" He thought for sure it was.
He called a bit ago to say when he fired it up this morning and waited for the fan to cut in it was indeed running in the WRONG direction and pulling air. He changed the wiring and went riding and no issues...
All is WELL and thank you everyone for your suggestions.
CanuckHoss
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Re: SB overheating
Glad it was something simple, and free. Typical symptoms for that, would have been surprised if it was anything else.
1998 Wild One Custom - Homebuilt
- CanuckHoss
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Re: SB overheating
Agreed Jack.Jack wrote:Glad it was something simple, and free. Typical symptoms for that, would have been surprised if it was anything else.
As always...look first at the things you just changed..hmmmm..the fan!!
CanuckHoss
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham
Barry Radu, President Destination Cycles
Airdrie, Alberta Canada
"Just BE HAPPY!! BE HAPPY!! BE HAPPY!!"--Abraham