Noise gone
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Intermediate
Joined: Nov 2008
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From: Iowa
Noise gone
Yesterday I took a Fathers day road trip with my son in law and his dad thru northern Missouri (found a freakin cool road
). I changed oil night before with 60 weight, thats the only thing I did. Now some of you know I've had a top end noise around the exhaust rocker for some time (change oil about 4 times since noise started, valve train parts at least one time) and I figured I'd give it one last hard run before I replaced the heads (best idea I had suggested to me) and if it lunched big deal. We ran hard with temps in the 90's and humid as hell.
After 130 miles running 70 - 90 mph the noise cured it self..... Why? Dunno.
Runs great but it never ran bad. Hell I dunno what the cause was, kinda bugs me but what the heck turned out to be a great fathers day!!!
). I changed oil night before with 60 weight, thats the only thing I did. Now some of you know I've had a top end noise around the exhaust rocker for some time (change oil about 4 times since noise started, valve train parts at least one time) and I figured I'd give it one last hard run before I replaced the heads (best idea I had suggested to me) and if it lunched big deal. We ran hard with temps in the 90's and humid as hell. After 130 miles running 70 - 90 mph the noise cured it self..... Why? Dunno.
Runs great but it never ran bad. Hell I dunno what the cause was, kinda bugs me but what the heck turned out to be a great fathers day!!!
Road Warrior
Joined: Apr 2007
Posts: 1,952
Likes: 15
From: Senoia, Ga., by way of Miami, Fl..
OK, had you been running 60w all along or was this a new idea?
I'm willing to give it a try myself if it may fix it. I've done about everything, including headwork, to mine and havent fixed it yet. Couple of times, I thought it was better, but it's still not right...
I'm willing to give it a try myself if it may fix it. I've done about everything, including headwork, to mine and havent fixed it yet. Couple of times, I thought it was better, but it's still not right...
HDF Community Team
Joined: Dec 2005
Posts: 5,376
Likes: 2,574
From: NC USA
It just dawned on me, woke me up in fact...
Remembering your having said it only rattled when it was warmed up and it had about 40,000 on the heads - what you may have had was a hot-spot in the combustion chamber or on the piston. Basically a small spot of carbon build up that was getting hot and acting like a glow plug causing some of the fuel to ignite before the plug lit the rest. That starts to add to the compression pressure before the piston reaches the firing point and causes a type of knock.
With this in mind, you may very well have "fixed" it with that good ride. If it starts doing it again, get it up to temp and pull the air cleaner, run it up to mid-range and with a hand spray bottle, spray water into the carb - that'll blast it out. Used to do that before every oil change, but when they quit making leaded fuel, I quit doing it.
Remembering your having said it only rattled when it was warmed up and it had about 40,000 on the heads - what you may have had was a hot-spot in the combustion chamber or on the piston. Basically a small spot of carbon build up that was getting hot and acting like a glow plug causing some of the fuel to ignite before the plug lit the rest. That starts to add to the compression pressure before the piston reaches the firing point and causes a type of knock.
With this in mind, you may very well have "fixed" it with that good ride.
If it starts doing it again, get it up to temp and pull the air cleaner, run it up to mid-range and with a hand spray bottle, spray water into the carb - that'll blast it out. Used to do that before every oil change, but when they quit making leaded fuel, I quit doing it.
Last edited by t150vej; Jun 22, 2009 at 11:08 PM.
Road Warrior
Joined: Apr 2007
Posts: 1,952
Likes: 15
From: Senoia, Ga., by way of Miami, Fl..
It just dawned on me, woke me up in fact...
Remembering your having said it only rattled when it was warmed up and it had about 40,000 on the heads - what you may have had was a hot-spot in the combustion chamber or on the piston. Basically a small spot of carbon build up that was getting hot and acting like a glow plug causing some of the fuel to ignite before the plug lit the rest. That starts to add to the compression pressure before the piston reaches the firing point and causes a type of knock.
With this in mind, you may very well have "fixed" it with that good ride. If it starts doing it again, get it up to temp and pull the air cleaner, run it up to mid-range and with a hand spray bottle, spray water into the carb - that'll blast it out. Used to do that before every oil change, but when they quit making leaded fuel, I quit doing it.
Remembering your having said it only rattled when it was warmed up and it had about 40,000 on the heads - what you may have had was a hot-spot in the combustion chamber or on the piston. Basically a small spot of carbon build up that was getting hot and acting like a glow plug causing some of the fuel to ignite before the plug lit the rest. That starts to add to the compression pressure before the piston reaches the firing point and causes a type of knock.
With this in mind, you may very well have "fixed" it with that good ride.
If it starts doing it again, get it up to temp and pull the air cleaner, run it up to mid-range and with a hand spray bottle, spray water into the carb - that'll blast it out. Used to do that before every oil change, but when they quit making leaded fuel, I quit doing it.Very good point, when I had my heads off a couple of months ago, the pictons were heavily carboned(30Kmi on the pistons).. The water will work wonders.
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Intermediate
Joined: Nov 2008
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From: Iowa
Thats the kicker I've had every weight oil from 10w40 upto 70 wt and had been running 70wt but I wanted fresh oil before heading out on a hot ride so I put 60 wt in it, they were out of 70wt. I don't think that had anything to do with it but what the heck do I know. I've been a wrench in a past life and this an't my first rodeo but it was pi**ing me off to no end trying to figre out the problem. I think the Hot spot diag. is got to be the right answer and if it happens again that wll be the first thing I try.
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Thread Starter
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Intermediate
Joined: Nov 2008
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From: Iowa
It just dawned on me, woke me up in fact...
Remembering your having said it only rattled when it was warmed up and it had about 40,000 on the heads - what you may have had was a hot-spot in the combustion chamber or on the piston. Basically a small spot of carbon build up that was getting hot and acting like a glow plug causing some of the fuel to ignite before the plug lit the rest. That starts to add to the compression pressure before the piston reaches the firing point and causes a type of knock.
With this in mind, you may very well have "fixed" it with that good ride. If it starts doing it again, get it up to temp and pull the air cleaner, run it up to mid-range and with a hand spray bottle, spray water into the carb - that'll blast it out. Used to do that before every oil change, but when they quit making leaded fuel, I quit doing it.
Remembering your having said it only rattled when it was warmed up and it had about 40,000 on the heads - what you may have had was a hot-spot in the combustion chamber or on the piston. Basically a small spot of carbon build up that was getting hot and acting like a glow plug causing some of the fuel to ignite before the plug lit the rest. That starts to add to the compression pressure before the piston reaches the firing point and causes a type of knock.
With this in mind, you may very well have "fixed" it with that good ride.
If it starts doing it again, get it up to temp and pull the air cleaner, run it up to mid-range and with a hand spray bottle, spray water into the carb - that'll blast it out. Used to do that before every oil change, but when they quit making leaded fuel, I quit doing it.HD Forum Stories
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HDF Community Team
Joined: Dec 2005
Posts: 5,376
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From: NC USA
Uh, well... all I can say is - it's just like everybody who's ever had a ghost while wrenching, it's the most insignificant, simple things that will slip your mind, get overlooked, forgotten and give you the most grief. Glad you didn't pull the heads straight away on my ramblings or suggestions, but then if you did and cleaned them, may have worked out just the same, but a lot of time and gaskets, maybe rings wasted.And if it's any consulation, I split my cases last year for a deep knock - found nothing out of specs. Freshened it up and two weeks later it was knocking worse. I had re-used plugs that had 10,000 on them, put in a new pair, knock gone ... DUH! They were glowing and doing the pre-ignition thang I reckon.
Ride safe Bro.....
Last edited by t150vej; Jun 24, 2009 at 04:28 PM.
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