Temperature guage not reading leads to.. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 11-04-2011, 02:06 PM Thread Starter
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Temperature guage not reading leads to..

Test driving a friends new, to her, 94 VN750 I noticed the temp guage had hardly moved off of the cold mark after 12 miles. Looking into it and doing a thurough bike inspection I found the following: the hose from the thermostat to the reservoir was pinched nearly shut by being misplaced and the reservoir was over full. After letting the engine cool down, I removed the pressure cap and found no coolant visible. It's my belief that the pinched hose would allow the coolant to travel down the hose as the engine warmed up but the pinch did not allow the coolant to travel back to the thermostat area as the engine cooled down. The temperature sensor at the thermostat housing was not exposed to coolant as the coolant was much to low to reach it. I also found alot of rusty coolant. I have drained and flushed the radiator, removed the drain plugs at the bottom and sides of the cylinders and got lots of rust out of them. I found the thermostat covered with rusty sludge and the iron pipe that comes out of the housing corroded away at the O-ring end and corroded where to two hoses attach to it. We've ordered a new pipe, all the hoses, a new thermostat, a radiator cap and O-rings. The Vulcan runs real nice so I think the engine hasn't overheated as yet. This is my first experince with a Vulcan and would like to read your comments about your experinces.
Bill
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post #2 of 8 (permalink) Old 11-04-2011, 02:40 PM
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Welcome

Howdy Bill, and welcome to the group!

It sounds like you are on the right track with maintenance. I initially thought that the thermostat placement was a problem, but now I'm not so sure-- I think that when the water pump is running, there will be flow in the system- enough to be read reliably on the gage. At some point, though, low cooland levels would affec the gage, I would imagine.

You will want to do the spline lube, requires removing the rear wheel. Search around here, you'll find an awesome, comprehensive writeup with pictures.

The consensus is that the major weak point of the bike is the cam chain tensioners, but if you don't hear any clacking, they probably don't need attention.

I'll be up in Sequim over Thanksgivng week.




Quote:
Originally Posted by Bill283 View Post
Test driving a friends new, to her, 94 VN750 I noticed the temp guage had hardly moved off of the cold mark after 12 miles. Looking into it and doing a thurough bike inspection I found the following: the hose from the thermostat to the reservoir was pinched nearly shut by being misplaced and the reservoir was over full. After letting the engine cool down, I removed the pressure cap and found no coolant visible. It's my belief that the pinched hose would allow the coolant to travel down the hose as the engine warmed up but the pinch did not allow the coolant to travel back to the thermostat area as the engine cooled down. The temperature sensor at the thermostat housing was not exposed to coolant as the coolant was much to low to reach it. I also found alot of rusty coolant. I have drained and flushed the radiator, removed the drain plugs at the bottom and sides of the cylinders and got lots of rust out of them. I found the thermostat covered with rusty sludge and the iron pipe that comes out of the housing corroded away at the O-ring end and corroded where to two hoses attach to it. We've ordered a new pipe, all the hoses, a new thermostat, a radiator cap and O-rings. The Vulcan runs real nice so I think the engine hasn't overheated as yet. This is my first experince with a Vulcan and would like to read your comments about your experinces.
Bill
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post #3 of 8 (permalink) Old 11-04-2011, 04:19 PM
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Low coolant levels can stop your coolant from flowing longer than normal because it will take longer for the thermostat to see the rise in temperature and open (flow is stopped until it does open) thereby causing a prolonged delay in the gauge's sensor seeing the rise in temp. I believe this sensor to be in the radiator.
Normally a vacuum is created whin the engine is cool (thermostat closed) which should pull coolant back from the overflow bottle. That is if your pressure cap is functioning properly. If your coolant level is too low however that same vacuum will just collapse your hose. I believe you've seen evidence of that.

The only thing higher than the thermostat, is the pressure cap. There's a reason the pressure cap is the highest part of the cooling system, Jerry.

Not to worry tho, sounds like your well on your way to making things right.

2010 Triumph Speedmaster
1995 Vulcan750
1989 XT350
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1959 M38A1

Last edited by kay; 11-04-2011 at 05:07 PM.
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post #4 of 8 (permalink) Old 11-05-2011, 07:56 PM
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Welcome to the Vulcan madness Bill.
Sounds like you have the cooling system repairs well in hand.

The rear splines between the drive shaft and final drive need to be checked and lubed ASAP as per fergy`s write up here:
https://www.vn750.com/forum/showthread.php?t=17274

Read it all the way through to wib714`s addition of cleaning and lubing of the spline connection of the final drive to the wheel hub too. The initial picture starts back at post #34 and the bulk of the pictures and procedure start at post #44.

While the rear wheel is off, you should check the brake drum, shoes, actuating cam, and free movement of the same, on the other side of the hub too. Clean and lube as needed.

My '91 is only 3 years older than your friend`s bike, and my steering fork tube dust seals are deteriorating pretty badly. If hers need replacing too, here are some instructions to follow.
https://www.vn750.com/forum/showthread.php?t=12827

Lots of helpful suggestions in the"ten things" link below too.

Gordon

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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 11-06-2011 at 11:02 AM.
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post #5 of 8 (permalink) Old 11-05-2011, 08:33 PM
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Quote:
Originally Posted by kay View Post
Low coolant levels can stop your coolant from flowing longer than normal because it will take longer for the thermostat to see the rise in temperature and open (flow is stopped until it does open) thereby causing a prolonged delay in the gauge's sensor seeing the rise in temp. I believe this sensor to be in the radiator.
Normally a vacuum is created whin the engine is cool (thermostat closed) which should pull coolant back from the overflow bottle. That is if your pressure cap is functioning properly. If your coolant level is too low however that same vacuum will just collapse your hose. I believe you've seen evidence of that.

The only thing higher than the thermostat, is the pressure cap. There's a reason the pressure cap is the highest part of the cooling system, Jerry.

Not to worry tho, sounds like your well on your way to making things right.
I have not checked first hand, Kay, but I was in the thinking that the bleeder valve was the highest point on the cooling system.
I have a parts bike, if all those parts are still on it I will check tomorrow.
Than again it may be to be able to bleed air from behind the termostat.

02 honda sabre 1100
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post #6 of 8 (permalink) Old 11-06-2011, 07:27 AM
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Quote:
Originally Posted by niterider View Post
I have not checked first hand, Kay, but I was in the thinking that the bleeder valve was the highest point on the cooling system.
I have a parts bike, if all those parts are still on it I will check tomorrow.
Than again it may be to be able to bleed air from behind the termostat.
I was referring to the cooling system of all liquid cooled vehicles.
The bleeder valve is not an essential part of the cooling system.

2010 Triumph Speedmaster
1995 Vulcan750
1989 XT350
M880
1959 M38A1
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post #7 of 8 (permalink) Old 11-06-2011, 08:57 AM
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kawi would not have put it in if it was not needed (essential.)
No more comments on this topic from me.

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post #8 of 8 (permalink) Old 11-06-2011, 10:37 PM
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Quote:
Originally Posted by niterider View Post
kawi would not have put it in if it was not needed (essential.)
No more comments on this topic from me.
A wise move I think

And that's all I have to add myself

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