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View Full Version : how do cam shaft dowl pins snap .. ?

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way2fastalon
07-13-2010, 09:26 PM
:scsa: so we were driving along and and its making the usual 1g lifter tick and something else starts making noise were like what is that i thought it was a bad rocker but the engine ran fine ... but then... we tried to limp it home and it quit running ..
turbotalon1g
07-13-2010, 09:33 PM
I'm assuming the dowels that the gears slide onto. My guess is that they were improperly installed.
Kracka
07-13-2010, 09:46 PM
Dowel pins are just for alignment when installing, if the cam gear bolts are properly torqued they are not needed to keep the cams in time. A snapped one could be a number of things including improper installation of the pin, improper installation of the cam gear on the camshaft, an incorrectly torqued cam gear bolt, or just a defective pin from the get-go. If a stock pins fails after 20 years though, that could just simple be fatigue.
4g63tcrazy
07-13-2010, 10:23 PM
must not have torqued the cam gear bolt down all the way and the gear spun on the cam and snapped it.
way2fastalon
07-13-2010, 10:43 PM
ill take some pictures ... sounds like all valves on the exhaust side are done ... no compression btw this engine has 250,000 miles on it with regular oil changes with mobile 1 syn 15w40 i was hoping to make it to 300,000 on it before something went wrong .. lol
mlomker
07-14-2010, 07:25 AM
this engine has 250,000 miles on it

Is that all? I thought my beater at 150 was doing well.
CarPsyco84
07-24-2010, 09:44 AM
ill take some pictures ... sounds like all valves on the exhaust side are done ... no compression btw this engine has 250,000 miles on it with regular oil changes with mobile 1 syn 15w40 i was hoping to make it to 300,000 on it before something went wrong .. lol

Camshaft could have seized too, hard to tell exactly till its all apart. Then its usually painfully obvious.
way2fastalon
07-25-2010, 02:05 AM
here are the pictures

10370

10371

10372
Pushit2.0
07-25-2010, 04:02 AM
The cam bolt loosened up, if the bolt is torqued properly it is the friction surface of the cam gear and cam that keep everything in line. This is a case of if you have an engine still running after the factory warranty or a ton of miles it might be a good idea to check everything over.

~John
way2fastalon
07-28-2010, 08:21 PM
the funny thing is the cam's where never touched ... all stock just did the t belt changes every 30,000