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baugustus
Samba Member
Joined: October 02, 2016
Posts: 1
Location: San Diego
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 Posted: Sun Oct 02, 2016 4:36 pm Post subject: Aluminum timing pulley question |
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| Hello, This one has me baffled. Just bought a manx with a 74 chassis / dual port motor. Just did a tune up and it is running like the plug wires are in the wrong position. Rechecked it and they are correct.. After getting more into it I decided to check the rotor position when cylinder 1 is at TDC. Confirmed # 1 piston is fully extended and both valves have a small gap. My timing pulley shows it is at BDC and not TDC. Any one seen this. I thought the pulleys were keyed so they can only go on one way. Any ideas? |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Sun Oct 02, 2016 5:45 pm Post subject: Re: Aluminum timing pulley question |
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so witch #1 are you looken at? also feal the pipes and that will tell you witch ones are not firing or are week. also sounds like your crabs may of jumped out of the synk  (linkage needs syncking) you may also of broken a spark plug or wire. or some other issue. is the zundleflodge right? |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26788
Location: Colorado Springs
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| Posted: Sun Oct 02, 2016 5:50 pm Post subject: Re: Aluminum timing pulley question |
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| Just because a pulley has degrees on it does not mean it's smarter than you are. If the pulley is marked wrong, just ignore the markings |
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jason
Samba Member
Joined: August 07, 2002
Posts: 3444
Location: Garage
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| Posted: Sun Oct 02, 2016 6:51 pm Post subject: Re: Aluminum timing pulley question |
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| Rotate the plug wires, youll see if they are wrong |
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mcmscott
Samba Member
Joined: March 12, 2010
Posts: 4856
Location: sanger ca
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| Posted: Sun Oct 02, 2016 6:53 pm Post subject: Re: Aluminum timing pulley question |
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Put water in the gas tank and report back
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Mon Oct 03, 2016 12:36 pm Post subject: Re: Aluminum timing pulley question |
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^^^wont that just make the front bumper rust?  , Im still trying to figure out why my cam is 180 degrees out.....but only sometymes....and why isant point gap lasted as a point lash like the valve/rocker gap/lash |
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Cusser
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Joined: October 02, 2006
Posts: 31378
Location: Hot Arizona
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Dale M.
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Joined: April 12, 2006
Posts: 20379
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Mon Oct 03, 2016 3:04 pm Post subject: Re: Aluminum timing pulley question |
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If you pulley looks like this, with TDC at the 12:00 position and key way at the 9:00 position there is nothing wrong with your pulley....
If your pulley is different that is your problem... Have heard of at least two times over the years where pulley was marked wrong...
Dale
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Ebel
Samba Member
Joined: June 07, 2015
Posts: 564
Location: New york
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| Posted: Sun Oct 09, 2016 10:03 am Post subject: Re: Aluminum timing pulley question |
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| I saw some pulleys being sold a few months ago that had two TDC and no BDC |
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mikedjames
Samba Member
Joined: July 02, 2012
Posts: 2743
Location: Hamble, Hampshire, UK
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| Posted: Sun Oct 09, 2016 12:06 pm Post subject: Re: Aluminum timing pulley question |
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Also remember that it is a simple matter for an engine builder to drop the distributor drive gear into the case in one of 22 different index positions.
And if it is not indexed correctly, it is a simple matter to rotate the distributor or rotate the leads while keeping the same order to have No1 fire at TDC.
In other words, in between the pulley markings and the rotor arm position are two places where the indexing can be wrong - a badly marked pulley, and a non-standard indexing of the distributor drive gear.
But if the crank slot is at 9 o'clock, and the valves are rocking on No1 cylinder, then the rotor arm is pointing where you need to connect the No1 sparkplug.
No1 is not necessarily in the direction where the distributor is marked with a notch.
It is fairly simple to re-index a distributor drive gear, and fairly simple to completely mess up the gear on the crank (will need a strip down and new gear) if you turn the engine and let the distributor drive gear rise up and bind with the drive on the crank.
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