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Old 09-20-2017, 09:54 AM   #1
Senior Member
Join Date: Jul 2015
Location: Southern Illinois
Posts: 594
37FS Onan 8000 Coolant Cap

Have you ever noticed something missing, know something was there, but then had to guess what it was? We're on an extended road trip, around 5k miles and just doing the morning fluid check and general look around. Found the cap missing behind the dipstick/oil fill cap on the Onan 8000 Generator. What's missing, what's it for?. Looking back in along the top left side of the generator and saw the open fill tube.and knew there was a cap there, once. Stuck a rag in it to keep dirt out until I got it fixed.

While in Cheyenne for a couple of days found an Onan repair shop on the Internet. Grabers Diesel Repair, was an authorized Onan parts and repair shop.
Google maps got me there and the guys knew exactly what was missing, the coolant reservoir cap, grey in color. Got a replacement for less than $10. Great people!

Drilled a hole in the twist handle portion of the cap and used a small shock cord to attach to bolt. If it falls out again, at least I won't loos it. MAYBE

Smooth Sailing,
Ric and Jan Golding
Southern Illinois
2016 Jayco Seneca 37FS
2016 Chevrolet Traverse
2018 Cheverolet Silverado
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Old 09-20-2017, 11:37 AM   #2
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Robbbyr's Avatar
Join Date: Dec 2014
Location: Akron
Posts: 1,866
Thanks for posting, will check and likely attach mine too!

Rob R.
Akron, OH
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST
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Old 09-20-2017, 02:52 PM   #3
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Join Date: Jun 2016
Location: Denver
Posts: 1,202
Cheyenne - you're 90 mins north. Enjoy the cool weather and sunshine!
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