radiator cap and reservoir grommet


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Tipsy McStaggers
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radiator cap and reservoir grommet

Post by Tipsy McStaggers » Sun Mar 24, 2019 2:51 pm



Loosing coolant from my radiator cap after the thermostat opens. Where's the best place to get an oem replacement? Also the rubber grommet on top of the reservoir tank has rotted and tore, would like to replace it. Any idea where to find one?



Good Hondog
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Re: radiator cap and reservoir grommet

Post by Good Hondog » Sun Mar 24, 2019 3:08 pm

The rubber grommet is actually a hose that goes into the reservoir tank. It's Honda # 19205-MF5-000. No aftermarket for that part. Both it and the thermostat are still available through Honda, but lots of aftermarket thermostats are available at probably half the price of Honda. There's a list of aftermarket equivalent parts on this site under cross reference part numbers for us to use for exactly what you're doing.

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redbug
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Re: radiator cap and reservoir grommet

Post by redbug » Sun Mar 24, 2019 5:59 pm

91302-317-700 is the part number for the thermostat o-ring and 193-657-003 is for the oem thermostat. Oem thermostat will perform better than a aftermarket. Warms up quicker and is really sensitive to temp changes.Be sure the jiggle hole on the thermostat goes up. Check your radiator cap also it is a important part of the cooling system.
" Riding on Tulsa Time "

Tipsy McStaggers
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Re: radiator cap and reservoir grommet

Post by Tipsy McStaggers » Sun Mar 24, 2019 11:14 pm

Not replacing thermostat. Need to replace raditor cap and return hose grmmet.

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DenverWinger
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Re: radiator cap and reservoir grommet

Post by DenverWinger » Mon Mar 25, 2019 6:05 am

I simply went to auto parts store and bought a generic 13 PSI "Lev-R-Vent" cap for mine, fits and works perfect, and sometimes the vent lever is useful when working on the bike.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
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Tipsy McStaggers
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Re: radiator cap and reservoir grommet

Post by Tipsy McStaggers » Mon Mar 25, 2019 12:23 pm

Thanks, will give it a try.

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redbug
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Re: radiator cap and reservoir grommet

Post by redbug » Mon Mar 25, 2019 1:13 pm

Tipsy McStaggers wrote:
Sun Mar 24, 2019 11:14 pm
Not replacing thermostat. Need to replace raditor cap and return hose grmmet.
Yes I understand, I just typed it out for some reason, radiator cap turned into a thermostat. Figured while your at the honda shop picking up your grmmet/hose you could get the radiator oem cap there also. Let us know how its going..
" Riding on Tulsa Time "

Tipsy McStaggers
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Re: radiator cap and reservoir grommet

Post by Tipsy McStaggers » Sat Mar 30, 2019 11:35 am

Tried an after market cap, same thing. Should coolant be overflowing when cap is off and bike is running at operating temp? Could that be the pump malfunctioning or bad head gasket? I guess if the cap was sealing proper coolant would go to the Reservoir.

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jaimenv
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Re: radiator cap and reservoir grommet

Post by jaimenv » Sun Mar 31, 2019 2:29 am

Tipsy McStaggers wrote:
Sat Mar 30, 2019 11:35 am
Tried an after market cap, same thing. Should coolant be overflowing when cap is off and bike is running at operating temp? Could that be the pump malfunctioning or bad head gasket? I guess if the cap was sealing proper coolant would go to the Reservoir.
If the head gasket is bad you will have compression going in to the cooling system, this will be obvious due to air escaping from the radiator filler when the cap is off engine running.

If the pump is working like it should you will see the coolant level lower at the filler with the cap off when the engine is running and the throttle is accelerated, then the coolant will come back up when the throttle is back off and it will spill due to temperature increase.

The coolant/water mixture will expand and flow out the radiator filler with the engine running at operating temperature (radiator cap off). The higher the water % in the coolant mixture the faster it will expand/boil, till the fan kicks in or the bike get ram air from moving. This is why you should always add coolant only when reservoir is low not water.

The broken coolant reservoir return grommet is causing the radiator to suck air when it cools instead of coolant from the reservoir.

Also check the radiator cap sealing surface for imperfections that may cause a leak. While at it make sure the radiator filler/cap neck is not busted/cracked.

PS. Big word of caution when messing around a sealed/closed/radiator cap ON coolant system. Play it safe don't burn.
Jaime
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DenverWinger
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1980 GL1100 STD Vetter (2005-)
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1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: radiator cap and reservoir grommet

Post by DenverWinger » Sun Mar 31, 2019 8:02 am

jaimenv wrote:
Sun Mar 31, 2019 2:29 am
Tipsy McStaggers wrote:
Sat Mar 30, 2019 11:35 am
Loosing coolant from my radiator cap after the thermostat opens.
Tried an after market cap, same thing.
PS. Big word of caution when messing around a sealed/closed/radiator cap ON coolant system. Play it safe don't burn.
Check inside the radiator neck for anything preventing the cap from sealing, any overflow is "supposed" to go out the overflow tube and not dribble down the radiator.

Hot radiators is exactly why I like my "Lev-R-Vent" cap... :mrgreen:
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

Tipsy McStaggers
Posts: 37
Joined: Thu Jan 04, 2018 10:45 pm
Location: Atlanta, Ga.
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Re: radiator cap and reservoir grommet

Post by Tipsy McStaggers » Sun Mar 31, 2019 11:04 am

I bent the tabs down some on the new cap. Seems to have sugged it down and stoped the leak. Going to take it out for a ride with the tank off and see what happens.

Tipsy McStaggers
Posts: 37
Joined: Thu Jan 04, 2018 10:45 pm
Location: Atlanta, Ga.
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Re: radiator cap and reservoir grommet

Post by Tipsy McStaggers » Sun Mar 31, 2019 2:36 pm

Rode it for about 40 miles and all is good🤞 so far. Think the original cap just got old and the new one was too loose. Also the toggle switch that a previous owner installed to operate the fan is going out. You have to jiggle it to make it work. Btw, all this started when my odometer was reading 66666.🤔 rode it enough today to get it to 67000. Lol

Tipsy McStaggers
Posts: 37
Joined: Thu Jan 04, 2018 10:45 pm
Location: Atlanta, Ga.
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Re: radiator cap and reservoir grommet

Post by Tipsy McStaggers » Sun Mar 31, 2019 2:39 pm

Correction 667000. 😆



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