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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
I'm rebuilding the top end and doing some cosmetic improvements to the cases and covers.
Two cam gears came out when I pulled the gear case cover. I thought, no big deal.
I pulled the cam gears and checked them for wear, etc...
When I went back to install the cam gears, I realized that there was no timing mark on my pinion gear.
There should be a timing notch on one of the teeth to get all the cam gears back in alignment when installing. But there is no timing notch on my pinion gear.
The service manual says that the timing notch is on the tooth that is center line of the key way on the pinion gear shaft. This is to make alignment of the pinion gear with the key easier when installing the pinion gear on the shaft.
So I assume the tooth that is centerline on the key way is the proper tooth to use for aligning the cam gears but without a timing notch on that tooth, I don't have a 100% confidence factor.
Anyone have experience with a pinion gear that does not have a timing mark on it?
I've attached closeup pictures below at full size. I used a Sharpie to mark the tooth that is centerline on the keyway, but I assure you that mark was made by me. There is absolutely NO notch or other distinguishing marks on any of the pinion gear teeth.
Never worked on a Sporty 1200 but I do know that any time I replace a cam and after all the setup and pushrod adjustments, I turn the motor over by hand to make sure that there will be no piston to valve interference.... Based on your initial description of your set up it sounds right... Just be careful... Better safe than sorry... Here's a pic I pulled off the net.....
Never worked on a Sporty 1200 but I do know that any time I replace a cam and after all the setup and pushrod adjustments, I turn the motor over by hand to make sure that there will be no piston to valve interference.... Based on your initial description of your set up it sounds right... Just be careful... Better safe than sorry... Here's a pic I pulled off the net.....
Never did it but in my manual, it states... On 1988-2003 models, align the pinion gear timing mark (A, Figure 67) with the center of the pinion shaft keyway (B) and install the gear.
So I assume, the gear will only go one way on that crank, so since you have no mark, just transcribe it like you did and mark it like you did. Pretty lame. I know in that video above of hotrod98, it truly looks out in that front exhaust cam to the right on their second attempt.
Assume you have plugs out. Always double check everything by turning when back together.
Years ago, I was rebuilding a 16 valve overhead cam motor. The cam shaft belt drove the water pump. Between year, the previous year water pump impeller was bumped 1/8 larger for additional cooling but a lot of the smaller impeller motors were dropped in the new year cars till they picket up the new supply. Problem was, it would slide in but lock if you turned it. My double checking caught it when the parts man gave me the larger pump impeller.
Last edited by Jackie Paper; Dec 2, 2016 at 01:35 PM.
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Cam Gear Alignment Issue
