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Thread: Timing Belts

  1. #1

    Timing Belts

    Well, this timing belt is a little odd. It has the right number of teeth between marks, but the marks don't line up properly with the gears. They're all off by a half tooth.

    Also, this is the first engine I've worked on that the timing marks don't come back around to the marks on the belt. I think I spun it 20 times and the closest it got back around was within a tooth. The gears all lined up with each other like they were supposed to, though. The right exhaust gear was maybe a half tooth off.

    I did all this twice, with the same result.

    20171112_124847.jpg 20171112_124805.jpg 20171112_124857.jpg

    Seems to me the gears lining back up is all that matters, but is this normal?
    Last edited by turbomacncheese; 11-12-2017 at 08:21 PM.

  2. #2
    Senior Member STiPWRD's Avatar
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    Yes, it's normal for the timing marks to not line up once you start turning the engine. They only need to line up at the time you install the belt.

  3. #3
    Thanks. I thought it was weird, but I guess not.

  4. #4
    The subaru engines are a special type engine, due to the head configuration, decking the block ,head gasket thickness and resurfacing the heads. Read below for the issue, has any body used these idlers?

    http://www.licmotorsports.com/blog/2...-timing-idlers

  5. #5
    Yeah, that brings back memories of the dodge motor I used to build. Didn't occur to me because the left side seemed spot on, but now that I think about it, I could have been slightly off on the crank gear because my oil pump doesn't have the mark.

    I'm still convinced it's more than adequate for what I'm building, but if I were building a race engine (and spending the money that goes along with one) I'd probably pony up a few hundred more and get adjustable gears.

    Thanks for reminding me what happens when you deck a block and mill a head.

  6. #6
    Senior Member SixStar's Avatar
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    Quote Originally Posted by DMC7492 View Post
    The subaru engines are a special type engine, due to the head configuration, decking the block ,head gasket thickness and resurfacing the heads. Read below for the issue, has any body used these idlers?

    http://www.licmotorsports.com/blog/2...-timing-idlers
    Great part! Make sure you get them dead nuts and tight.
    Owner/builder - AEM Intakes 818R #85

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