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camshaft bearing caps

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

Guest
Hello All,


I know this is going to sound a little lame, but I do not have access to a 1/4 inch drive torque wrench. I have a 1/2 inch one but I fear that using it for the bearing cap bolts on my 79 gs 850 would not be accurate. So what I need is for you to estimate, or suggest a method of determining how tightly, or more correctly how to estimate 7.5 ft lbs per bolt using a 1/4 socket and wratchet.

I know, I know, I find myself gringing too. I always want to doing everything perfectly and to spec, but find myself at a loss with this one.


Judging by the 7.5 ft lbs spec, I can assume that the bearing caps just provide a groove for the cams to ride in, while the chain, the idler wheel for the chain, and fearfully the caps themselves (to a lesser degree I hope) help to keep the cams from raising out of their bearing places.

As a side note, I was out 2 teeth on the exhaust cam. And I am hoping that this is what was causing my bike to foul all four plugs, regardless of everything else that I tried to do.
At first I blamed Clymers with their ambigious description of describing the exhaust cam timing marks "#1 arrow to line up with, or be slightly below 1-2 mm the gasket base surface of the head." But well stuff happens.

Sorry for my verbosity, however I needed to vent here, lest I take it out on my beloved 850. :lol:

Yours truly in retarded cam timing

 
Ghetto torque wrench

Ghetto torque wrench

I guess you could take a spring scale (like you weigh fish with) and a 1 foot ratchet and pull the ratchet with 7.5 lbs, since this would be 7.5 lbs * 1 ft = 7.5 ft*lbs, or a 6" long ratchet would be like this 15 lbs* 1/2 ft = 7.5 ft*lbs

After saying that though I would not do it, I think from hilo or napa you can buy a crappy torque wrench for under $40.00, that would be my option.

You also migt wonder how your bike's cams got so out, could be your cam chain tensioner is out of wack!
 
Re: camshaft bearing caps

quietone said:
Hello All,


I know this is going to sound a little lame, but I do not have access to a 1/4 inch drive torque wrench. I have a 1/2 inch one but I fear that using it for the bearing cap bolts on my 79 gs 850 would not be accurate. So what I need is for you to estimate, or suggest a method of determining how tightly, or more correctly how to estimate 7.5 ft lbs per bolt using a 1/4 socket and wratchet.

I know, I know, I find myself gringing too. I always want to doing everything perfectly and to spec, but find myself at a loss with this one.


Judging by the 7.5 ft lbs spec, I can assume that the bearing caps just provide a groove for the cams to ride in, while the chain, the idler wheel for the chain, and fearfully the caps themselves (to a lesser degree I hope) help to keep the cams from raising out of their bearing places.

As a side note, I was out 2 teeth on the exhaust cam. And I am hoping that this is what was causing my bike to foul all four plugs, regardless of everything else that I tried to do.
At first I blamed Clymers with their ambigious description of describing the exhaust cam timing marks "#1 arrow to line up with, or be slightly below 1-2 mm the gasket base surface of the head." But well stuff happens.

Sorry for my verbosity, however I needed to vent here, lest I take it out on my beloved 850. :lol:

Yours truly in retarded cam timing

Click to expand...

First get a torque wrench. I have a bit of experience with the exhaust cam not being degreed correctly and cam bolts over torqued. I had a shop rebuild my Yam XT350 engine. Never ran right when I got it back. Finally after not getting any relief from said shop. I found they set the exhaust cam off by one link.

On top of that they had overtorqued and stripped 3 of the 8 cap bolts. ( Aluminum head) I had to tap them all and was able to get just enough new thread to install 6mmX 45mm in place of the existing 6mmX 40mm.

Unfortunitly one of the journals got a bit scored where the cam cap must have wked. loose. I cleaned it up with Crocus Cloth, hopefully it may work. Otherwise a new head is in order.

Any way. I am actually putting it back together this afternoon. Hopefully it will wk.

Moral: Do your own wk. If at all possible.

Triple check the critacle stuff.
Don't overtorque. Follow the manual.

And yes I think it is possible the cam timing could well be the root
cause of your problem.

I will let you know if it fixed my XT. I should have it back together by this evening.

BTW I have (2) complete 79 GS850 parts bikes if you need anything off them let me know.

Keep us posted if the cam timing fixes it.
Cheers,
Charlie
 
Quiet tone,
Just got my XT back together and test rode.
Runs perfect. Smooth, quiet, sweet.
Get your cam timing set and let us know how it works.
Charlie
 
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