loud clacking niose


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rainman212dew
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loud clacking niose

Postby rainman212dew » Sat Jul 16, 2016 5:55 pm



Tried to start my 1987 1200, must have been oil in the cylinder, everything stopped dead. Put the bike in gear and rolled it back and forth till it turned over. Then it started but now I have a loud clacking noise. It sounds like it is coming from the right side under the valve cover but it's hard to tell for sure. Any ideas on what it is?



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Iaustin
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Re: loud clacking niose

Postby Iaustin » Sat Jul 16, 2016 11:22 pm

When my fuel pump quit it was making loud clacking noise

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Maz
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Re: loud clacking niose

Postby Maz » Sun Jul 17, 2016 4:44 am

rainman212dew wrote:Tried to start my 1987 1200, must have been oil in the cylinder, everything stopped dead. Put the bike in gear and rolled it back and forth till it turned over. Then it started but now I have a loud clacking noise. It sounds like it is coming from the right side under the valve cover but it's hard to tell for sure. Any ideas on what it is?

When you say "must have been oil in cylinder" how do you know? If it was, you may have bent or broken a rod while forcing the engine to turn over. Alternatively, you may have snapped a timing belt and pistons are hitting valves.
Either way, I would remove valve covers and belt covers to check before starting the engine again.
Maz
Nostalgia is not what it used to be!

rainman212dew
Posts: 12
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Location: Bloomfield, Iowa
Motorcycle: 1987 GL1200A Aspencade

Re: loud clacking niose

Postby rainman212dew » Sun Jul 17, 2016 9:50 am

Maz wrote:
rainman212dew wrote:Tried to start my 1987 1200, must have been oil in the cylinder, everything stopped dead. Put the bike in gear and rolled it back and forth till it turned over. Then it started but now I have a loud clacking noise. It sounds like it is coming from the right side under the valve cover but it's hard to tell for sure. Any ideas on what it is?

When you say "must have been oil in cylinder" how do you know? If it was, you may have bent or broken a rod while forcing the engine to turn over. Alternatively, you may have snapped a timing belt and pistons are hitting valves.
Either way, I would remove valve covers and belt covers to check before starting the engine again.
Maz

It has done it before but has been a long time. Started taking it apart, got the right valve cover off, don't see anything yet. I'm going to take the timing cover off today.

rainman212dew
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Location: Bloomfield, Iowa
Motorcycle: 1987 GL1200A Aspencade

Re: loud clacking niose

Postby rainman212dew » Sun Jul 17, 2016 9:55 am

Iaustin wrote:When my fuel pump quit it was making loud clacking noise

Thanks for the reply, it's not the fuel pump, coming from deeper inside.

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Maz
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1979 CB750L
1990 Yamaha FJ1200

Re: loud clacking niose

Postby Maz » Sun Jul 17, 2016 2:12 pm

rainman212dew wrote:
Maz wrote:
rainman212dew wrote:Tried to start my 1987 1200, must have been oil in the cylinder, everything stopped dead. Put the bike in gear and rolled it back and forth till it turned over. Then it started but now I have a loud clacking noise. It sounds like it is coming from the right side under the valve cover but it's hard to tell for sure. Any ideas on what it is?

When you say "must have been oil in cylinder" how do you know? If it was, you may have bent or broken a rod while forcing the engine to turn over. Alternatively, you may have snapped a timing belt and pistons are hitting valves.
Either way, I would remove valve covers and belt covers to check before starting the engine again.
Maz

It has done it before but has been a long time. Started taking it apart, got the right valve cover off, don't see anything yet. I'm going to take the timing cover off today.

Ok so now we know it's done it before, that puts a different slant on it. Is it possible that it was flooded with fuel due to a leaking float valve and now it's fired up on two or three cylinders and you are hearing the normal racket that comes from primary chain etc when these flat fours are not running on all 4?
Maz
Nostalgia is not what it used to be!

rainman212dew
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Motorcycle: 1987 GL1200A Aspencade

Re: loud clacking niose

Postby rainman212dew » Sun Jul 17, 2016 2:57 pm

Maz wrote:
rainman212dew wrote:
Maz wrote:When you say "must have been oil in cylinder" how do you know? If it was, you may have bent or broken a rod while forcing the engine to turn over. Alternatively, you may have snapped a timing belt and pistons are hitting valves.
Either way, I would remove valve covers and belt covers to check before starting the engine again.
Maz

It has done it before but has been a long time. Started taking it apart, got the right valve cover off, don't see anything yet. I'm going to take the timing cover off today.

Ok so now we know it's done it before, that puts a different slant on it. Is it possible that it was flooded with fuel due to a leaking float valve and now it's fired up on two or three cylinders and you are hearing the normal racket that comes from primary chain etc when these flat fours are not running on all 4?
Maz
When I had it running it was running smooth, just making the noise.

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sun Jul 17, 2016 3:04 pm

If the timing belt slipped a tooth or two could the piston hit the valve and still run without missing?

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sun Jul 17, 2016 7:55 pm

rainman212dew wrote:If the timing belt slipped a tooth or two could the piston hit the valve and still run without missing?

Got both valve covers and timing belt covers off. Everything looks good so far. I can't get it to make any noise turning it over by hand.

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Re: loud clacking niose

Postby Jelbon » Mon Jul 18, 2016 2:28 pm

Pull each spark plug lead off while it is running to see if you can get any change in noise.
Check your valve clearances, if some are exceptionally large you may be able to pinpoint the offending cylinder. Bent valve, damaged rocker, valve sticking in the guide etc.
Are all the spark plugs the same color on the tip?
Move each cylinder to top firing position and feel around through the plug hole with wire to find out if there is any collision between piston and valve.

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Tue Jul 19, 2016 3:27 am

Jelbon wrote:Pull each spark plug lead off while it is running to see if you can get any change in noise.
Check your valve clearances, if some are exceptionally large you may be able to pinpoint the offending cylinder. Bent valve, damaged rocker, valve sticking in the guide etc.
Are all the spark plugs the same color on the tip?
Move each cylinder to top firing position and feel around through the plug hole with wire to find out if there is any collision between piston and valve.
Thanks for the reply. I will try all of your tips. I have the valve covers off and the timing belt covers off, from what I can see so far everything looks good and seems to be moving the way it's suppost to. The spark plugs all look good.

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Re: loud clacking niose

Postby WingAdmin » Tue Jul 26, 2016 8:37 pm

What compression are you getting in each of the cylinders?

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sun Jul 31, 2016 11:11 pm

WingAdmin wrote:What compression are you getting in each of the cylinders?

I don't know yet, my compression tester won't reach the spark plug hole.I have to get a new one then I will post the results.

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sat Aug 20, 2016 12:01 pm

rainman212dew wrote:
WingAdmin wrote:What compression are you getting in each of the cylinders?

I don't know yet, my compression tester won't reach the spark plug hole.I have to get a new one then I will post the results.

So I got a new compression tester, #1 cylinder is 150, #2 150, #3 115, #4 150. Looks like something wrong with #3, I'm going to start taking that side apart today see what I find.

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sat Aug 20, 2016 6:15 pm

rainman212dew wrote:
rainman212dew wrote:
WingAdmin wrote:What compression are you getting in each of the cylinders?

I don't know yet, my compression tester won't reach the spark plug hole.I have to get a new one then I will post the results.

So I got a new compression tester, #1 cylinder is 150, #2 150, #3 115, #4 150. Looks like something wrong with #3, I'm going to start taking that side apart today see what I find.

This may sound like a dumb guestion but is normal for #3 piston to stop about an 1/8 in. from the edge of the cylinder when #1 goes all the way to the edge?

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Asp
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Re: loud clacking niose

Postby Asp » Sun Aug 21, 2016 9:11 am

No. Sounds like you have bent a rod when the engine hydraulic-ed.

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sun Aug 21, 2016 10:16 am

Asp wrote:No. Sounds like you have bent a rod when the engine hydraulic-ed.

That's what I was afraid of. Sounds like I get to dismantle the rest of it. It looks like it has gotten antifreeze in that cylinder, so I'm thinking it had a bad head gasket. Thanks for the reply. I really didn't want to take it apart any further without a second opinion.

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Re: loud clacking niose

Postby twocams » Sun Aug 21, 2016 11:06 am

If you did bend a rod? Your looking at pulling the engine, and crankshaft to replace. Maybe just as easy to replace the engine. But make sure thats your problem before you get all hyper. :shock: :shock:

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Re: loud clacking niose

Postby Rusty Bike » Sun Aug 21, 2016 12:04 pm

Hmm, if the noise happened before and if the rod is bent, sounds like it is, the bike may have been running like that for a long time. I find it unlikely that you could bend a rod by pushing a bike with a hydro locked cylinder. I would think the tire would slide way before you do damage to the engine. I suppose anything is possible!

rainman212dew
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Re: loud clacking niose

Postby rainman212dew » Sun Aug 21, 2016 1:01 pm

Rusty Bike wrote:Hmm, if the noise happened before and if the rod is bent, sounds like it is, the bike may have been running like that for a long time. I find it unlikely that you could bend a rod by pushing a bike with a hydro locked cylinder. I would think the tire would slide way before you do damage to the engine. I suppose anything is possible!

The last time it happened it just started to turn over and suddenly stopped. I let it set for a while then it started fine. This time I put it in gear and rocked it back and forth, not hard, just gently till it turned over. I didn't make that clear before. Anyway it didn't make any noise before. I'll have to some more research before I actually tear into it. Thanks for the reply I need all the help I can get.




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