January 30th, 2013, 01:33 PM | #1 |
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Camshaft Chain Inspection
Is there such a thing? Looked in the manual. Can't find anything regarding it.
FYI, have the engine ripped open so thoughts I'd check the chain and see if it needs replacement. Don't know what I'm supposed to be checking for though. |
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January 30th, 2013, 02:26 PM | #2 |
wat
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measure 20 links. since you cant get 20 links of the chain perfectly straight with the cams in place, you should be able to measure 10 and extrapolate out, but make sure you measure different sections of the chain as parts may be unevenly stretched.
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January 30th, 2013, 03:23 PM | #3 |
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The chain is already out. So, I'm just measuring at different points on the chain to make sure they're all around the same or am I looking for a max stretch after which the chain would be unusable?
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January 30th, 2013, 04:01 PM | #4 |
wat
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if its good, it will be within the service limit at any point that you measure it at. measurements should be consistent. if its inconsistent or over the service limit just get rid of it. you should be measuring from the center of the rivet of the chain. each rivet is one link. so measure the length of 20 rivets.
20 Link length Standard: 127-127.4mm Service Limit: 128.9mm
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January 31st, 2013, 03:52 PM | #5 | |
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Quote:
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February 1st, 2013, 01:14 PM | #7 |
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February 1st, 2013, 01:46 PM | #9 |
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February 1st, 2013, 01:48 PM | #10 |
wat
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i'm not, but now that you are so happy that someone has helped you i'll be unsubscribing from this thread.
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February 1st, 2013, 02:25 PM | #11 |
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lol
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February 1st, 2013, 05:27 PM | #12 | |
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Quote:
Clymer says Kawi doesn't specify it either, remember? |
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February 1st, 2013, 05:32 PM | #14 |
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February 1st, 2013, 05:33 PM | #15 |
wat
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it just so happens that i had a brand new cam chain recently. from a parts house. its an oem kawi chain with kawi branding on the packaging. it measured correctly according to the specs above. i also have an out of limits chain that was clacking like crazy it correctly measured outside of service limit. but if you don't like the numbers i copy/pasted, thats cool.
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February 1st, 2013, 05:40 PM | #16 | |
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Quote:
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February 2nd, 2013, 12:48 PM | #17 | |
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http://en.wikipedia.org/wiki/Sage_%28Sophos%29 It is true, all these chains and sprockets follow standards that have been around since the beginning of the last century and, since they have work flawlessly, have not changed since then. http://en.wikipedia.org/wiki/Roller_...hain_standards Each link of a chain is a flat bearing with little angular movement, cyclic load and marginal lubrication, all of which is very bad for a long life. Under those conditions, stiction and metal to metal contacts are frequent, which lead to progressive wear and increasing clearance between the journal and shaft. Why is that clearance critical? Full-film conditions of lubrication are when the bearing's load is carried solely by a film of fluid lubricant and there is no contact between the two bearing surfaces. There is a narrow range of clearance that can keep that ideal condition of lubrication in a flat bearing. What the elongation of the chain tells us? It tells us how much that clearance has grown for each bearing connecting two links. What we measure is an amplification of that via the addition of the clearance's increment of several links under some longitudinal load. What happens when the measured elongation exceeds the maximum allowed by the specifications (0.1 mm for each bearing)? The two secondary consequences are: -A little retardation of the valve timing respect to the angular position of the crankshaft and -The altered chain's pitch damages the sprockets, changing the shape of the teeth, which will induce over-load and damage in a new chain after replacement. The more dangerous consequence is a deterioration of the lubrication of each bearing. Initially, load is carried partly by direct surface contact and partly by a film forming between the two; and for extreme increment of the clearance, the full load is carried by surface-to-surface contact. Each shaft starts being loaded with progressive bending loads. All that deterioration process ends up in the catastrophic failure of one or more of the shafts-journals, with the consequent lock down or destruction of the engine. Read more about flat bearings here: http://en.wikipedia.org/wiki/Plain_bearing#Lubrication Measuring the chain between edges of the rivet is more precise that guessing the center of the rivets.
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February 2nd, 2013, 08:09 PM | #18 |
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February 2nd, 2013, 08:29 PM | #19 |
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I thought the reason they started using chains instead of belts is so you don''t have to replace them.
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