Y-Block Dampner Timing Marks
Posting Guru
Joined: Jul 2006
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From: Fairfield, CA
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
They tend to be pretty faint. Should be a long line marked 0* TDC and the other marks shorter, indicating degrees BTDC, etc.
In case anybody doesn't know, the originals because of their age have problems by now because the rubber bonding deteriorates and the outer ring will slip off its index, so the marks are pretty much useless anyway when you do find them, and won't do much for vibration damping either.
This bond can also fail altogether and do real nasty stuff - like launch through the radiator at highway speed . Not good.
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In case anybody doesn't know, the originals because of their age have problems by now because the rubber bonding deteriorates and the outer ring will slip off its index, so the marks are pretty much useless anyway when you do find them, and won't do much for vibration damping either.
This bond can also fail altogether and do real nasty stuff - like launch through the radiator at highway speed . Not good.
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Laughing Gas
Joined: Jul 2007
Posts: 1,100
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Thanks Ted, I found them. I was given a tip on another forum where to find them. If you draw a straight line thru the center of the dampner and line it up square with the key slot, then go about 108 degrees to the right, that will get you close. I hear what your saying on old dampners. Is there a place in the US to have them rebuilt? The stock dampner I removed has slipped. I marked it before removal and it is just a bit left of the line instead of 108 degrees to the right. The donar is old and used to, but the rubber is showing some wear and tear.
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Laughing Gas
Joined: Jul 2007
Posts: 1,100
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Not all dampners are marked the same. Some are on the pulley, some are on the balancer. Some are just a "v" groove, or a high spot. These dampeners are old and the rubber is most likely deteriorating. I believe the good news is if they come loose, they dont go thru the radiator and down the highway at rocket launch speed. They go towards the timing chain cover but stay on. At least thats what I have been told.
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Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
There used to be the damper doctor, not sure if they are still around?
The cost, plus shipping both ways is still probably cheaper than buying new, though? Didn't want my truck to be down that long so bit the bullet and bought a new manufacture damper off of eBay, I think it's through Mummert's or at least the same folks who supplies them. Quality part. The old one on mine was trashed, slipped, and had a wobble. Scary! Engine is happier now for sure, too.
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The cost, plus shipping both ways is still probably cheaper than buying new, though? Didn't want my truck to be down that long so bit the bullet and bought a new manufacture damper off of eBay, I think it's through Mummert's or at least the same folks who supplies them. Quality part. The old one on mine was trashed, slipped, and had a wobble. Scary! Engine is happier now for sure, too.
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Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Yeah, looks like http://www.damperdoctor.com is alive and well so that's an option. They sell new ones or, will reman your unit and send it back to ya.
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Lead Driver
Joined: Nov 2002
Posts: 9,670
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From: Jefferson City, MO
Interesting, here is my timing mark for my 239.
I was wondering how I was going to set the timing. are there stickers you can get or something? Maybe I'm missing some marks somewhere.
I was wondering how I was going to set the timing. are there stickers you can get or something? Maybe I'm missing some marks somewhere.
Cargo Master
Joined: Apr 2003
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There are two general styles I'm aware of.
One uses a pointer with the damper having the timing markings.
The other uses a pointer with the timing markings and only one mark on the damper.
I believe that yellow one needs the other pointer.
One uses a pointer with the damper having the timing markings.
The other uses a pointer with the timing markings and only one mark on the damper.
I believe that yellow one needs the other pointer.
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
A vacuum gauge works slick for setting timing, also for setting idle mixture, so you can just hang the timing light on the wall for decoration. Maybe the performance guys need them, folks who study advance curves and swap out distributor springs, I dunno.
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Elder User
Joined: Dec 2006
Posts: 559
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From: Redondo Beach, CA
You're correct. My engine likes ~16° INITIAL ADVANCE, set with vacuum gauge but rechecked with light. But that will put my TOTAL ADVANCE way to high. That's where a light comes in, along with checking operation of vacuum and mechanical advance. No way to do that with just a Vacuum Gauge.