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Author Topic: oh dear....... a tale of timing chain woes  (Read 4434 times)

oz_johnno

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Re: oh dear....... a tale of timing chain woes
« Reply #30 on: February 04, 2013, 11:04:09 PM »
mmmm didnt know about the need to do the 'outrigger bearing' and crank sprocket.  I will ask the guy who did the repairs (he is a professional) about the requirement for this.  I brought all the parts in the motobins cam chain kit (chain, tensioner etc) and that was all.

Oh crap, not more money !!

OZ

Offline Barry

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Re: oh dear....... a tale of timing chain woes
« Reply #31 on: February 05, 2013, 03:50:35 AM »
Quote
I have been reading zen and the art of motorcycle maintenance.


I read it every year or two. It's a book for life to be read again when you've fogotten enough to make it worth while.

I love his steady calm, thinking approach to maintenance. The concept of gumption hissing out when thing go wrong is so real and familiar that we all must have felt it at times. I guess getting the cam chain one tooth out would have been one of those moments. The book is a great lesson for working on the bike and for recognising when it's time to stop and think.

The one aspect of the book which dates it in terms of awareness of the environment is the way he dumps oil out of the bike just about anywhere.  The frequency of oil changes is obsessive which on it's own is environmentally unfriendly without leaving a trail of it across America. Oil would have been cheap and that approach to oil disposal musn't have been unusual back then.

« Last Edit: February 05, 2013, 04:05:39 AM by bhodgson »
Barry Cheshire, England 79 R45

Offline montmil

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Re: oh dear....... a tale of timing chain woes
« Reply #32 on: February 05, 2013, 09:34:48 AM »
Quote
Oh crap, not more money !!  OZ

Steady on, Mate.

The crankshaft sprocket should be examined for excessive wear. If you've had chain-drive motorcycles, you may have experienced worn sprockets from dirt ridin' days. Sharp, pointy and/or "hooked" teeth are a visual indicator that it's time to renew both chain and sprockets.

Comparing your cam chain sprocket teeth to a photo of a new sprocket can be helpful. See the Motobins site for snaps.

The smaller crankshaft sprocket rotates twice for every one turn of the cam shaft sprocket. Simply put, the cam sprocket has half the mileage as the crank's sprocket.

Proper lubrication and a functional cam chain tensioner can keep sprockets and bearing happy for 100,000 miles or better. You can handle the kilometers conversion.

Do you recall if your cam chain was making a death rattle sound before you replaced it? Usually heard with throttle roll-off during deceleration. That can be a sign of a worn out tensioner shoe, spring and chain guide.

Another tip: Worn cam chains, sprockets and tensioners can sometimes be diagnosed by observing a jumpy image when using a timing light on the flywheel marks.

Certainly not trying to scare the crap outta ya, OzJohnno. Your ex's attorney will do that quite nicely. [smiley=thumbdown.gif]

Yo, Barry... I'm sure a few others will also 'fess up, but it was quite common back in the day to pour your used oils along your backyard fence line as a weed and grass control. Less yard work left more time for riding and other much more meaningful activities. Oh, and hearing protection was for sissies. Truth.

I wear hearing aids as a sign of a life well spent. ;D


Monte Miller
Denton, TEXAS
1978 BMW R100S
1981 BMW R65
1983 BMW R65
1995 Triumph Trophy
1986 VW Cabriolet

Offline Barry

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Re: oh dear....... a tale of timing chain woes
« Reply #33 on: February 05, 2013, 09:58:43 AM »
I have a mate (he has 3 bikes, so a practical man) who to this day paints his sheds and fences with used engine oil. Apparently it makes a great free preservative if you like dark brown. Probably drips on the ground and controls the weeds too.

I tell him I also knew a mechanic who contracted and died from liver cancer due to daily exposure to old engine oil so perhaps it's best not to bath in the stuff too often.  

« Last Edit: February 05, 2013, 09:59:24 AM by bhodgson »
Barry Cheshire, England 79 R45

Offline montmil

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Re: oh dear....... a tale of timing chain woes
« Reply #34 on: February 05, 2013, 01:26:40 PM »
Quote
...I also knew a mechanic who contracted and died from liver cancer due to daily exposure to old engine oil so perhaps it's best not to bath in the stuff too often.

Whew! And here I was thinking liver problems were a result of over indulgence in adult beverages.
Thanks, Doc Barry. This one's for you... [smiley=beer.gif]
Monte Miller
Denton, TEXAS
1978 BMW R100S
1981 BMW R65
1983 BMW R65
1995 Triumph Trophy
1986 VW Cabriolet

oz_johnno

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Re: oh dear....... a tale of timing chain woes
« Reply #35 on: February 05, 2013, 02:12:06 PM »
montmil >>  Phew, I feel I have dodged a bit of a bullet there as my 86 model R65 has only a shade over 34,000 original miles on it.

It was brought into the country as a 'jap import' and my dad, didn't ride it much.  By the time it got to me a shade over 12 months ago it only had 40,000km (25,000) original miles on it.

How do I know they are original miles? well I took her along to the local BMW club coffee morning and everyone who looked at it judged that because of the overall condition and the lack of wear on the rear brake peddle, the milage was original.

When my mate took the timing chain cover off, it would have been the first time it had been off since it left the Baveria Motor Werks factory in  1986.

As far as a 'death rattle' is concerned, there was none, and it was only after it was pointed out to me that I managed to hear a slight timing chain noise..... so better to get in earlier than later I thought.

Beryl is special and I will own her while my arse still points to the ground

OZ
« Last Edit: February 05, 2013, 02:20:20 PM by oz_johnno »

Offline Barry

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Re: oh dear....... a tale of timing chain woes
« Reply #36 on: February 08, 2013, 08:26:21 AM »
Recently came up on the Airheads list.

Thought it appropriate to earlier sentiments in this thread.
Barry Cheshire, England 79 R45

oz_johnno

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Re: oh dear....... a tale of timing chain woes
« Reply #37 on: February 13, 2013, 03:34:10 AM »
Quote
Recently came up on the Airheads list.

Thought it appropriate to earlier sentiments in this thread.

Nice one.........

I got beryl home this afternoon.  I had to get some help from my stalker/girlfriend Sarah, but its all ok.  I 'thanked' her senseless this arvo.

Everyone happy

OZ