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  #16  
Old 09-16-2010, 11:27 PM
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I recently changed my timing chain with an IWIS brand chain. I measured the chain stretch with the indicator method and could not see any unusual stretch, 304,000 miles on odometer, but I changed it anyway beucause of the performance mods I have done. It is easy if you follow the the instructions that others have posted and you use the correct crimping tool.

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  #17  
Old 09-17-2010, 09:50 AM
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Quote:
Originally Posted by Rudolf_Diesel View Post
I recently changed my timing chain with an IWIS brand chain. I measured the chain stretch with the indicator method and could not see any unusual stretch, 304,000 miles on odometer, but I changed it anyway beucause of the performance mods I have done. It is easy if you follow the the instructions that others have posted and you use the correct crimping tool.

did you change rails and tensioner?
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  #18  
Old 09-17-2010, 10:53 AM
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The rails looked finer, I did replace the tensioner.
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  #19  
Old 09-17-2010, 01:39 PM
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Wow! those pictures of the different brands of timing chains really speak for themselves! Definatly something to keep in mind!

Diesel911; do you or anybody else know if there is an overhaul procedure for the vacuum pump? I'm not sure what drives it- the chain?

On my old one ton, the vacuum pump failed on me driving to work, and when I was headed home, some dumbass broad discovered that she just HAD to turn left, and flew across two lanes of traffic...and cut me off in the process. I rear ended the hell out of that car, and put her taillights into her back window- all cause my vacuum pump failed, and I had no power brakes. Total bummer; at least for her! My insurance didn't pay her!

I don't mean to hijack the thread, but since the discssion of possible VP failure leading to timing chain failure has come up, I'd be interested hearing if it's worth it to overhaul the vacuum pump while you're performing the timing chain R&R?

All of you guys have been so helpful to me on here, and I just wanted to say thanks again.
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  #20  
Old 09-18-2010, 02:48 AM
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Originally Posted by farmfuel View Post
Wow! those pictures of the different brands of timing chains really speak for themselves! Definatly something to keep in mind!

Diesel911; do you or anybody else know if there is an overhaul procedure for the vacuum pump? I'm not sure what drives it- the chain?

On my old one ton, the vacuum pump failed on me driving to work, and when I was headed home, some dumbass broad discovered that she just HAD to turn left, and flew across two lanes of traffic...and cut me off in the process. I rear ended the hell out of that car, and put her taillights into her back window- all cause my vacuum pump failed, and I had no power brakes. Total bummer; at least for her! My insurance didn't pay her!

I don't mean to hijack the thread, but since the discssion of possible VP failure leading to timing chain failure has come up, I'd be interested hearing if it's worth it to overhaul the vacuum pump while you're performing the timing chain R&R?

All of you guys have been so helpful to me on here, and I just wanted to say thanks again.
If you Vacuum Pump is one with a Piston the complete overhaul cost of parts is almost as much as a new Vacuum Pump and you end up with no warranty.
The kit that replaces the parts that would fall into the Engine when they fail is around $250; the kit of the Piston end is arond $65.

About 3 months ago there was a thread on just replacing the bearing on the drive arm (my name for it).
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  #21  
Old 09-18-2010, 04:21 AM
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I'm at 150k with no service records, stressing about the chain myself
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  #22  
Old 09-18-2010, 09:49 AM
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Originally Posted by JayT View Post
I'm at 150k with no service records, stressing about the chain myself
at 150K it's likely you are fine, but it's not difficult to check it. follow the procedure linked in post 5 or so and see if you need worry.

what car are you driving?
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  #23  
Old 09-18-2010, 06:31 PM
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Originally Posted by vstech View Post
at 150K it's likely you are fine, but it's not difficult to check it. follow the procedure linked in post 5 or so and see if you need worry.

what car are you driving?
The procedure doesn't seem too hard

I'm driving a W126 SEC,
I know W126's have interference engines as well
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  #24  
Old 09-18-2010, 06:42 PM
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Yeah, SEC being a gasser, r and r process is different, of course. But if memory serves me correctly, they were plagued with chain issues at earlier mileage.
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  #25  
Old 09-18-2010, 07:03 PM
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M117 at 150K miles is ripe for a new chain. I wouldn't wait.

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  #26  
Old 09-20-2010, 09:53 AM
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Guides are the biggest issue on the V8s. M117 you can only go with OEM style, M116... Meyle has upgraded rails that pretty much do not fail.

This is what killed my old '86 420sel
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  #27  
Old 09-26-2010, 02:21 PM
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my own experience...

Just wanted to relay my own experience with timing chain replacement--following dieselgiant's procedure, I was rolling in the new chain (with tensioner removed) and the links didn't match up on the cam! See photo below.

My buddy who was helping suggested the tensioner should take care of it, and sure enough it lined up just fine with tensioner installed--so don't worry about it if there's some slop before getting it buttoned back up.
Attached Thumbnails
timing chain replacement-img_1025.jpg  
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  #28  
Old 09-26-2010, 04:23 PM
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Quote:
if you have a Vacuum Leak and do not fix it for a long time your VP is working harder.
this is incorrect in my humble opinion
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  #29  
Old 09-26-2010, 07:41 PM
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Originally Posted by engatwork View Post
this is incorrect in my humble opinion
If the Vacuum Pump has a good seal to it when it reaches the Max Vacuum the Piston stays push up or part way up held by the Vacuum and that Pivot/Folcrum Arm with the Bearing (I do not know the real name for it) is completely or partially not riding on the Lobes on the Timers. So it is either not moving or not moving very much.
If there is a Vacuum Leak the Piston and Arm are moving their full distance all of the time.

In a recent thread it was said that the later models have a Van type Vacuum Pump. On those it is always turning.
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  #30  
Old 09-26-2010, 08:04 PM
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I had the W124 diesel vacuum pumps in mind. Mechanically they are running anytime the engine is running and it does not matter if it is loaded up or not.

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