Topic: Cb550 cam chain guide worn out?

[BigBird]

Can i have an opinion on wether this depicted part is dysfunctional or not. The plastic has come off, so that the bare metal pins have grind a mm into the cyl block. My unaswered question is if the position is crucial, and how aware of what kind of hard plastic tube i should fit to replace the torn pieces or maybe i could cast some from epoxy. Thanks in advance

Simen

[BigBird]

So i googled around for what material the plastic cover on the holding pins are, and it seems they are the same as the guide itself - nylon. I found some info on different nylon materials with strength number 6.4, 6, 4.6, where 4.6 is apparently what firms like saab and bmw uses for their chain guides.

from engineering tip forum were cam chain guides for race engines are discussed: http://www.eng-tips.com/viewthread.cfm?qid=292501

patprimmer (Publican)18 Feb 11 17:53
An important point.

From memory, nylon 6 melts at about 215 deg C, nylon 6.6 melts at about 256 deg C and nylon 4.6 melts at about 295 deg C

Also, the higher the melting point, the more they retain their physicals as they approach the melting point then the more sudden the change.

The cam chain guide is stamped 6.2 so i figure that must be the material and puts it relatively low on the strength scale according to the above stated. Making a casting mold for this would be a good challenge, but I just found an OEM offered for what equals 27$ http://2hs.dk/produkter/60366-honda/2992-honda-14611-323-000/ and don´t have the courage to take on a casting project. But for you who finds this thread while searching for a solution to your broken chain guide, there is an opportunity to make a cast in nylon 4.6 and be Saab-reliant on partnr. 14611323000

Otherwise I found some interesting cam chain guide makers on this thread http://www.dotheton.com/forum/index.php?topic=40252.150

Cheers good folks

[strynboen]

try CMS.nl..for new parts..i reused mine they vere not so bad