Hi all, I took my '78 out on its first long road test yesterday, and when I got home, I noticed some coolant spray inside the shelter and down the filler neck...it looks like the coolant was pushing up and out of the cap instead of into the expansion tank.
The bike didn't overheat or run hot, despite several 2-3 mile pulls up long mountain grades. Any idea as to why it might be venting around the cap instead of going back into the expansion tank? I filled the tank to just above the low mark and ran the vent tube down under the bike. The line to the radiator filler neck is submerged in coolant in the expansion tank. The hose from the neck to the tank isn't kinked.
Coolant Venting from Around Cap?
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- propav8r
- Billet Alum. Member
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- CYBORG
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Re: Coolant Venting from Around Cap?
Might need a new cap. Make sure its on straight, and is tight
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
1977 custom with 1200 engine
1985 gl1200
- propav8r
- Billet Alum. Member
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- Joined: Thu Oct 13, 2016 5:00 pm
- Location: Franklin, NC
Re: Coolant Venting from Around Cap?
It's a brand new cap...should've mentioned that. Just a standard parts store cap, I think 13psi.
- RB
- Honored Life Member
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Re: Coolant Venting from Around Cap?
Check lip for dings, hose for cracks, neck for cracks. Might want to run it with the sides off/down and watch???
98 1500 SE..
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her ((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
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75 REBUILD SOLD
FAIR WINDS,
RB
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her ((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD
FAIR WINDS,
RB
- salukispeed
- Platinum Member
- Posts: 1951
- Joined: Sun Feb 21, 2010 10:08 am
- Location: Oak Forest Illinois US
Re: Coolant Venting from Around Cap?
Maybe new cap does not have the rubber sealing washer that seals the top of the neck to the cap and forces the flow to the reservoir. some have brass instead of rubber
Honda 72 CL100 sold
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
- propav8r
- Billet Alum. Member
- Posts: 282
- Joined: Thu Oct 13, 2016 5:00 pm
- Location: Franklin, NC
Re: Coolant Venting from Around Cap?
That's a thought. I'll check that when I get home.salukispeed wrote:Maybe new cap does not have the rubber sealing washer that seals the top of the neck to the cap and forces the flow to the reservoir. some have brass instead of rubber
- propav8r
- Billet Alum. Member
- Posts: 282
- Joined: Thu Oct 13, 2016 5:00 pm
- Location: Franklin, NC
Re: Coolant Venting from Around Cap?
I guess I just got a crappy cap. I bought another one yesterday (a Stant instead of the house brand at the parts store), popped it on, and all is well.
- salukispeed
- Platinum Member
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- Joined: Sun Feb 21, 2010 10:08 am
- Location: Oak Forest Illinois US
Re: Coolant Venting from Around Cap?
So nice to get an answer and it not be something more involved, Congratz
Honda 72 CL100 sold
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
74 CB750 K4 nice driver
1966 CA77/305 Dream nostalgic driver
84 GL1200I work in progress
1970 CT 70
1982 GL500 Interstate
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