Volvo Penta 5.7 Temp Gauge Not Working

[SDSeville]

Hi Everyone,
1986 Bayliner 2560 Volvo Penta 5.7 temp gauge not working.

• Pulled temp sender wire and grounded it
• Gauge spiked to max temp
• Replaced temp sender (Teflon tape on top 1/3 of threads)
• Gauge still doesn't work.

Any suggestions? Thanks!

 

[Bondo]

Hi Everyone,
1986 Bayliner 2560 Volvo Penta 5.7 temp gauge not working.

• Pulled temp sender wire and grounded it
• Gauge spiked to max temp
• Replaced temp sender (Teflon tape on top 1/3 of threads)
• Gauge still doesn't work.

Any suggestions? Thanks!

Ayuh,..... Tape can isolate the sender from ground, ya gotta use paste,.....
'n make sure the housing has a good solid ground,....

 

[SDSeville]

Ayuh,..... Tape can isolate the sender from ground, ya gotta use paste,.....
'n make sure the housing has a good solid ground,....

Thanks Bondo! I will give it a try tomorrow and report back.

 

[Fun Times]

Thanks Bondo! I will give it a try tomorrow and report back.

Also you'll need to make sure the temp is actually rising/getting up to temperature... A stuck open thermostat from engine cold can keep the temp from reaching a point that it won't read on the gauge...Say right around 100 degrees may not move the needle much/any.

Also depending on T/housing design, Worn out, damaged, missing, installed wrong inner gaskets/O_Rings could cause an affect such as this too.

 

[Scott Danforth]

verify the temp with a heat gun. as FT stated, the T-stat may have failed open. Also, as Bondo pointed out. tape may be preventing the sender from making ground

 

[dypcdiver]

Quick check of ground by cleaning an area of the body of the temp sender and a wire from cleaned area to a known good ground. 2 min job to confirm.

 

[SDSeville]

Removed tape yesterday and used Permatex 59235 High Temperature Thread Sealant. Still no reading on gauge. Ran for 20+ minutes and engine was not warm to the touch. Purchased infrared thermometer today and will check actual temp after running for another 20+ min tomorrow.

 

[BRICH1260]

I bet you have a bad thermostat.

 

[SDSeville]

Ran 20+ minutes yesterday and never got over 92 degrees. I will replace the thermostat this weekend.

 

[SDSeville]

Finally installed new thermostat. Gauge works fine now.
Thanks everyone!!