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Timing Belt mishap-stupid on me

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Old Oct 23, 2023 | 05:56 PM
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Exclamation Timing Belt mishap-stupid on me

First off, thanks everyone for all the advice and help.
Not sure why my stupid was out more today than the rest, but it was. The timing belt was still good but had 30 yrs & 105k miles. So, I made 3 marks on the cam sprocket, and 3 marks in different color on the crank sprocket. I removed the belt and stretched it out on piece of wood (nail at 1 end and other end) and transferred the 2 marks onto the new belt. put the new belt back on and hand cranked it 2 revolutions. Or at least I thought. The marks did not line up I thought, so I pulled off the belt......stupid. SOOO now, the cam was off from the crank.

How can I get the cam and crank back in sync to put the belt back on properly? or am I FOOBAR?
BJ
 
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Old Oct 23, 2023 | 07:23 PM
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I will copy and paste the procedure here for you.....give me a few minutes......and no, you are not FUBARED.
 
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Old Oct 23, 2023 | 08:17 PM
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OK, these images are from the 1988 Mazda Workshop Manual, if you have any questions about the procedure, just ask them here.

Also, you can click on the image and increase the size, and print it if needed, I would assume.










 
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Last edited by MeB2000; Oct 23, 2023 at 08:19 PM.
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Old Oct 23, 2023 | 08:33 PM
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In Step 3-(5) Do I make 2 complete rotations from TDC to TDC clockwise on crank? just making sure.
Thnaks,
BJ
 

Last edited by bjzman99; Oct 23, 2023 at 08:50 PM.
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Old Oct 23, 2023 | 09:15 PM
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Originally Posted by bjzman99
In Step 3-(5) Do I make 2 complete rotations from TDC to TDC clockwise on crank? just making sure.
Thnaks,
BJ
Yes, you are just rotating the engine to equalize the tension on each side of the timing belt.
 
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Old Oct 23, 2023 | 09:27 PM
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You can turn the engine several more times if you'd like.....just verify that the timing is still aligned properly by stopping at TDC and ensuring that both the cam gear and the crank gear both are aligned to their timing markers, as they were when you installed the timing belt.

Keep in mind that the crank gear turns 2 revolutions to the ONE revolution of the cam gear.......so you need to turn the engine crankshaft over twice to have TDC on both the cam & crank again. In other words......if you turned the crankshaft over THREE full revolutions, the camshaft gear would NOT be at TDC (12:00 o'clock position).......the "1" mark on the cam gear would be at the 6:00 o'clock position......you would have to turn the crankshaft one more revolution to get the cam gear "1" mark back to the 12:00 o'clock position again.
 
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Old Oct 24, 2023 | 07:33 AM
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Originally Posted by bjzman99
The timing belt was still good but had 30 yrs & 105k miles.
No - the timing belt LOOKED good but had 30 yrs & 105k miles. It was beyond its useful life even though it looked "good" by visual inspection.

Fortunately, these B2000 and B2200 engines are non-interference engines, but some online sources incorrectly state otherwise.
 
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Old Oct 24, 2023 | 09:41 AM
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All good now!! Thanks for the help.
BJ
 
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