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Technical Help Forum
Started by dtimm612 at 06-10-2008 3:48 PM. Topic has 15 replies.
  
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 06-10-2008, 3:48 PM
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dtimm612
 
Joined on 06-02-2008
Rochester, Minnesota
Posts 93
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Sorry for starting another post, but now knowing that I seem to have the same problem as billy worries me a bit. Here's my stright forward question:
Has anyone with an engine that sounded just like this:
http://s199.photobucket.com/albums/aa113/thepicklescx500/?action=view¤t=SPA51591.flv
Fix the noise with a new cam chain, tensioner, guides, etc?
81 Silverwing GL500
84 Magna VF1100C (V65)
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06-10-2008, 10:01 PM
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MildGL500
Joined on 01-19-2008
Guelph, ON, Canada
Posts 101
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I'd almost say that sounds like a popped lifter, but that can't be. :-(
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06-10-2008, 10:12 PM
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Reg in Bristol
Joined on 03-11-2006
Bristol UK
Posts 782
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Spot on MildGL500 !!
I'm pretty damn sure that 'Thepickles' the source of that vid
is Steve a member of our club.(sitename - thepickles)
and that horrible noise is an incredibly worn cam and lifter.
When they pulled the engine apart they posted pics and the amount
of wear was stunning
The 'Mongrel' is on the road
78 frame, ZAB gubbins, 82 'TI' motor, Suzuki clocks, MZ screen
and gaiters, Kawasaki master cylinder, BMW horns
DIY wiring
and all thrown together with a fanatical inattention to detail :-)
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06-11-2008, 5:53 AM
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Billy
Joined on 05-20-2008
Lakeville MN
Posts 48
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Yeah that video is from there.
Heartbreaking.
If you arent sure if your noise is the same do the following steps:
1) Get a long Screwdriver or Piece of pipe and listen to the spots on the engine outlined on Robs page under the how to buy section. Pay close attention to the sounds around the rear near the ispection port and above, as if its you cam chain and tensioner causing the sound you should hear it pretty well there.
2) make sure your tappetts are correct. in fact i checked mine about 40 times. brutal. what finalyl made me realize that they were not the source was when i tightened them down to NO GAP and the noise was still persistent.
3) Pull your radiator and check the cooling fan clearance. if its hitting somewhere it will possibly produce the same sound as worn lifters / camshaft OR loose out of adjustment tappets.
4) Tach Cable - i also read a post where someones tach cable was broken in the connection behing the radiator / fan producing a similar noise.
5) pull the head and feel for a worn shaft and check the lifters at the same time. you will see if they are worn.
6) Exhaust Boots / Intake Boots - i was told also that if you have an exhause leak or leak coming in from the carb area that it too may force a sort of tapping noise. i would imagine that has something to do with back pressure. i didnt look at this as much because of the consistency of the tapping. it tapped really bad. to the point where i felt silly driving the thing bad.
I also misadjusted the Cam chain on the wrong compression stroke. From what i gather it is supposed to be on the TL on the compression stroke for the left side. When i finally adjusted mine correctly, it did indeed clean up quite a bit of extra noise, however the tap was still real evident.
Good luck! I hope its not the same issue!
Billy
Billy from MN
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06-11-2008, 11:25 AM
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dtimm612
Joined on 06-02-2008
Rochester, Minnesota
Posts 93
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Reg, what would cause that extensive of camshaft wear? Would a bit of aluminum being worn off by the cam chain do that much damage?
Here's a picture of how much aluminum wear I'm referring too
Dylan
81 Silverwing GL500
84 Magna VF1100C (V65)
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06-11-2008, 5:58 PM
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MildGL500
Joined on 01-19-2008
Guelph, ON, Canada
Posts 101
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Spot on? I thought these had "mechanical" (solid) lifters? Unless you mean that the lifters arn't following the cam profile, which in turn would mean that the cam lobe is wacking the bottom of the lifter instead of pushing it up? (OUCH!!!!!) 
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06-11-2008, 6:40 PM
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t053376
Joined on 03-02-2008
B.C. Cananda
Posts 332
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dtimm612,
Looking at your engine, where is the wear that is evident? I dont see any worn bolts from excessive chain movement. When adjusting the valves, there is a definite "clack" or freeplay in the valve train. This noise must also be evident when the engine is running. I guess the problem is isolating other "ticking clacking" noises from the normal valve train noise!
80 Custom / prev
83 GL 650I / prev
67 S65 Step thru in restoration
82 Custom / current
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06-11-2008, 6:54 PM
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DaveF
Joined on 06-11-2008
Lawrenceville, GA
Posts 1,232
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 dtimm612 wrote: | | ...Would a bit of aluminum being worn off by the cam chain do that much damage?... |
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There is some aluminum worn away, but not really enough to worry about. See this thread.
My Web Site
1982 GL500
1983 GL650
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06-11-2008, 7:13 PM
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t053376
Joined on 03-02-2008
B.C. Cananda
Posts 332
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Dave,
Did you replace the worn bolt and housing shown in your picture? If not I guess a new chain, guide and tensioner should actually last longer than the original as it will take longer for it to wear into the chewed up area!! Maybe the CX camchains are made of a softer metal so that we dont have to deal with cam and or crank sproket wear!!
80 Custom / prev
83 GL 650I / prev
67 S65 Step thru in restoration
82 Custom / current
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06-12-2008, 4:53 AM
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DaveF
Joined on 06-11-2008
Lawrenceville, GA
Posts 1,232
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I replaced the chewed-up bolt, cam chain, guide, and tensioner. The sharp edges on the housing were deburred and cleaned so there would be no small stray bits of metal flaking off.
My Web Site
1982 GL500
1983 GL650
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06-12-2008, 7:12 AM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,648
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The cam followers on these bikes can be inserted incorrectly and still work.I've had a couple of engines off Ebay for spares that had had them incorrectly orientated.They will cause preamture wear of the Camshaft/lobes.some Cam followers can be hand linished back to serviceable state.Unfortunately the cam shafts can't.
My Music
http://www.reverbnation.com/pauldouglas/
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Id quot circumiret, circumveniat
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06-13-2008, 8:52 PM
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t053376
Joined on 03-02-2008
B.C. Cananda
Posts 332
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What does the cam look like when it is worn?? Are we talking a major groove from the follower resulting in a definite flat spot on the peak of the lobe?? I purchased a spare cam off EBay ... 80 CX Custom. Lobes look intact ... polished from the follower.
80 Custom / prev
83 GL 650I / prev
67 S65 Step thru in restoration
82 Custom / current
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06-14-2008, 8:03 AM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,648
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| Anonymous wrote: | | t053376 wrote: | What does the cam look like when it is worn?? Are we talking a major groove from the follower resulting in a definite flat spot on the peak of the lobe?? I purchased a spare cam off EBay ... 80 CX Custom. Lobes look intact ... polished from the follower.
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They sound good to me.You would know straight away if they were badly worn.Hard to explain.Yes there would ne flat spots and or a worn curve on one side of the lobes if the cam followers had been inserted incorrectly.Luckily the case hardened metal on the Cam followers is softer than the Cam shafts so they tend to wear before the Cam shafts,most likely by design.
HTH :)
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forgot to log in :O
My Music
http://www.reverbnation.com/pauldouglas/
Join Just In Case :)
http://globalcxglvtwins.hostingdelivered.com/
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06-14-2008, 1:00 PM
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GoldFalcon
Joined on 05-25-2008
Washington State
Posts 35
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in the interest of contributing to the general body of "clacking noise" knowledge...
I have also been chasing an annoying "clacking" on my 78 CX500. Did all of the normal things: adjusted valves, cam tensioner, etc...and while the noise level coming from the rear of the engine and tapet covers was greatly diminished there was still a very loud clacking coming from the front of the engine. In my particular case it is almost inaubile at a cold idle, but becomes very apparent as soon as I roll on the throttle. The frequency and volume is in direct relation to the rpm: more rev, more clack. Beyond the clack the engine is running fantastically. No flat spots in the throttle, no sputters, backfiring, smoke, or hesitation anywhere in the powerband. No oil leaks (not burning any either), no coolant leaks, no nothing except for a great running motorcycle. But there is still that freaking clacking.
I've isolated what SEEMS to be the source as just forward of the heads in the fan area. Today I pulled the radiator and inspected the fan. It wasn't loose or visibly cracked (though there was a small nick on one of the blades) and the housing didnt seem to be in contact with the blades anywhere. That said, I'm almost certain that the source of the noise is the fan. There's a decent bike shop here that doesn't turn their nose up at old Hondas so I think I'll ride it down and let them take a listen.
Just one more thing to consider. I know that when I first heard it my blood went cold with thought of "CAMCHAIN" but now I'm pretty confident that isn't the problem.
Wolves, oh wolves now can't you see? There ain't no wolf can sing like me. And if there was then I suppose that he'd belong in Idaho.
-Josh Ritter
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06-18-2008, 7:50 PM
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Jay in NYC
Joined on 04-29-2007
Brooklyn, NY
Posts 153
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If you happen to find out what the heck that clacking is, let me know. I've gone through the same steps, checking the valves, adjusting my cam tensioner, checked my fan....and it still persists. The only other thing I can think of is a worn con rod bearing......but lets hope not.....
1978 CX 500
MAC 2-1
Drag Bars
Cafe headlight/turn signals
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Honda CX500 & G... » CX500 GL500 Tra... » Technical Help ... » Re: Clacking noise
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