Engine running hot
Cruiser
Joined: Jan 2007
Posts: 163
Likes: 1
From:
Saw all the advice, all good but I think you have a bad Cam Position Sensor. Its in the nose cone. They will crap out when they go bad due to high heat and will run fine when cold up until it reachs the heat point that causes a failure. They have a sealed sensor in electrical glue, the heat either loses up the glue and the sensor craps out or there could be a crack that opens and separates the contacts.
To test get a hair dryer and remove the nose cap. Leave the bike stone cold and get the sensor up to high heat with the dryer. If the bike won't start you found your culprit.
Mine went last year, same symtoms as yours, good until it heated to a certain point. The part is a $125 os so and is pretty simple to replace.
To test get a hair dryer and remove the nose cap. Leave the bike stone cold and get the sensor up to high heat with the dryer. If the bike won't start you found your culprit.
Mine went last year, same symtoms as yours, good until it heated to a certain point. The part is a $125 os so and is pretty simple to replace.
Thread Starter
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Intermediate
Joined: Mar 2009
Posts: 32
Likes: 0
miscycles - I run a pressure gauge full time - cold psi @ start up usually around 25-30# When hot, it runs 12-20 psi.
skooba - I'm running a compu-fire single fire ignition. I initially thought my ign was crapping out. I also tried the hair dryer test.
I really don't feel like this would cause the entire cam cover to get so hot. I'm talking almost exhaust pipe hot.
I also don't see where this would have caused the inner bearing, cam gear, & pinion gear to bust up like they did.
I'm thinking mechanical heat build up caused one of the bushings (cam? pinion?) to seize up solid enough to lock up the gears, & consequently breaking gear teeth.
Now that I have all of the broken components replaced, I'm back to square one - there is a mechanical issue & it's causing the entire cam cover to get hot.
Now, it's very possible that the hot cam cover may be causing the ignition to heat up & crap out, much like the hair dryer would. But, not the other way around.
on with the troubleshooting.
Tonight is my last graveyard shift, so I'll be able to spend the next couple of days checking more out.
Thanks, guys!
I'll keep ya'll posted.
G
skooba - I'm running a compu-fire single fire ignition. I initially thought my ign was crapping out. I also tried the hair dryer test.
I really don't feel like this would cause the entire cam cover to get so hot. I'm talking almost exhaust pipe hot.
I also don't see where this would have caused the inner bearing, cam gear, & pinion gear to bust up like they did.
I'm thinking mechanical heat build up caused one of the bushings (cam? pinion?) to seize up solid enough to lock up the gears, & consequently breaking gear teeth.
Now that I have all of the broken components replaced, I'm back to square one - there is a mechanical issue & it's causing the entire cam cover to get hot.
Now, it's very possible that the hot cam cover may be causing the ignition to heat up & crap out, much like the hair dryer would. But, not the other way around.
on with the troubleshooting.
Tonight is my last graveyard shift, so I'll be able to spend the next couple of days checking more out.
Thanks, guys!
I'll keep ya'll posted.
G
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Your oil pump is good and probably isn't the crux of your problem. I must have missed the post about the broken gear,I apologize for that. Yes it does sound mechanical. I don't remember an evo ever breaking a gear, even if the oil pump locked up the key in the pump would fail before a gear would break. Did you ever check the clearance of the valve train in the top end? Perhaps the retainers are hitting the valve seal/guide causing an extra load on the valve train, which would heat up the bushing/nose cone. On last easy one, how close is your exhaust to the nose cone?? Hope something here helps.
Intermediate
Joined: Nov 2007
Posts: 48
Likes: 2
This is true.....I had a Sifton push rod chip a chunk off the tip and it went through the oil pump. The metal piece took out the oil pump housing and the gears. When the pump locked up, the key failed, but not until it flaired the oil pump shaft enough to where it would not readily pull out of the engine case.
Thread Starter
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Intermediate
Joined: Mar 2009
Posts: 32
Likes: 0
Well, I checked out the components on the oil pump - the individual oil galleys, the drive geras, the shaft. all looks ok, nothing abnormal that just stuck out. I did replace the PRV spring with a new one.
I'll start putting this beast back together & see what happens.
Thanks, all!
G
I'll start putting this beast back together & see what happens.
Thanks, all!
G
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
When you put it back together, remember to keep turning the shaft to ensure that nothing is binding. If you have some binding then you have to shift the body pieces until you heve no binding/excess drag. Then prime the pump before starting.
Cruiser
Joined: Nov 2008
Posts: 139
Likes: 0
From: Beaver, OK. (No mans land)
I read your post where you said you have replaced the PRV spring, Did you replace this with stock spring. I ask this because if you put in a stiffer spring you may not be getting enough oil to the cam and lower end as the pump sends all the oil to the top end first, Here is what the service manual says.
The pressure created in the top end oil system causes oil pressure regulating valve to open. Oil is then allowed to travel thru oil pump passage into a crankcase passage and thru cam gear cover passage lubricating pinion shaft bushing and lower connecting rod bearings.
Really would not think this is your issue as your heating up more at higher rpm and at this higher rpm you should have higher oil pressure to unseat this pressure regulating valve, But may be something to keep in mind. You should have a strong return of oil to the tank at rpm if your pressure regulating valve is opening. Just a thought!
The pressure created in the top end oil system causes oil pressure regulating valve to open. Oil is then allowed to travel thru oil pump passage into a crankcase passage and thru cam gear cover passage lubricating pinion shaft bushing and lower connecting rod bearings.
Really would not think this is your issue as your heating up more at higher rpm and at this higher rpm you should have higher oil pressure to unseat this pressure regulating valve, But may be something to keep in mind. You should have a strong return of oil to the tank at rpm if your pressure regulating valve is opening. Just a thought!
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Road Warrior
Joined: Dec 2008
Posts: 1,476
Likes: 23
From: Summit, Mississippi
Engine running hot
I have tried to read through all the post here and I hope I am not duplicating something already said. All the concerns over the fuel starvation, ignition wiring, manifold seals and timing issues are the things to look for, but I had a similar issue once on a 97 FLH. Mine finally just stopped on the road and would not start. It finally broke to the point I found the problem. Mine was so hot the ignition module had melted off the end of the plate. Tore it down again and discovered my inner cam bearing was bad. It had ran okay for so long, the inner journal of the cam itself had worn to the point it was very noticeable and all it ever did was get hot down there...ran fine as long as it was running. It had an aftermarket cam in it, but I don't remember which one. I had gotten the bike used and it is very apparent the previous owner had not replaced the cam bearing when he changed the cam. I am sure you have done all that and replaced that HD bearing with the torrington as part of this investigation and took a real close look at the cam journals and the bushing in the nose cone cover as well.
Tourer
Joined: May 2006
Posts: 256
Likes: 7
From: Western NC
This is just a stab in the dark here, Geronimo, what kind of cam are you running? I took a SE11 with low miles on it out of my bike and the raer juornal of the cam that went in the inner cam bearing was scored terrible like all the hardened surface had broken down. just something to check.