This group provides a forum for owners and operators of diesel powered motorhomes and 5th wheel tractors to discuss mechanical issues, regulatory issues (US, Canada), ownership, insurance, campground accommodations, trip reports/suggestions, and other topics relevant to large RVs and the people who drive them.
.Alan wrote:
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Mark (s),
Yes, Kent alluded to those offset woodruff keys in his video, maybe that would be a good next step, and worry about the chain later, when it stretches more. I get some smoking, which I feel that I shouldn't have, with my rebuilt turbo, rebuilt injectors, clean fuel system etc, maybe the timing will help. If MB makes a 5* offset woodruff key, then it seems like it's within spec to use.
How long do timing chains last? (I know, it depends) Do timing chains stretch evenly throughout their life, or do they stretch more near the end? I don't want to have a catastrophic failure of the chain.
My '85 300D now has 232,000 miles on it.
I bought this car in 2005 with 93,000 miles, and have kept up the maintenance schedules for the 140k that I've owned it.
If I keep at my current usage, it'll be around 300K in 7yrs (2026), and if the chain stretch rate is even, it'll be about 7* off by then, w/o offset woodruff key, 2* off with the 5* key.
Thanks
As far as I have read, when you hit 5 deg, you are already at the maximum.
Also, keep in mind that you have restored the cam timing, but the FIP also needs to be reset. It too is subject to offset from TC wear.
-- Mark L. Bardenwerper, Sr. Technology...responsibly, thoughtfully http://citroen.cappyfabrics.com
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Mark (s),
Yes, Kent alluded to those offset woodruff keys in his video, maybe that would be a good next step, and worry about the chain later, when it stretches more. I get some smoking, which I feel that I shouldn't have, with my rebuilt turbo, rebuilt injectors, clean fuel system etc, maybe the timing will help. If MB makes a 5* offset woodruff key, then it seems like it's within spec to use.
How long do timing chains last? (I know, it depends) Do timing chains stretch evenly throughout their life, or do they stretch more near the end? I don't want to have a catastrophic failure of the chain.
My '85 300D now has 232,000 miles on it.
I bought this car in 2005 with 93,000 miles, and have kept up the maintenance schedules for the 140k that I've owned it.
If I keep at my current usage, it'll be around 300K in 7yrs (2026), and if the chain stretch rate is even, it'll be about 7* off by then, w/o offset woodruff key, 2* off with the 5* key.
Thanks
Rob
I bought a new timing chain years ago, but never installed it. Instead, I decided to install an offset woodruff key at the cam gear:
Greatly saved the time and trouble it takes to replace the chain, which will eventually stretch anyway. By using the offset key, I can retain my broken-in/pre-stretched chain, and keep proper cam timing, probably indefinitely. And, because the keys are available in 1-degree increments from 2- to 5-degree offsets, you can set the cam timing to within a gnat's ass.
Mark in Centennial, CO
On August 2, 2019 at 5:45 PM "Aleph93 aleph93@ca.rr.com [diesel_mercedes]" <diesel_mercedes@yahoogroups.com> wrote:
Kinda quiet on our MB e-list.
I finally got some time to do the MB 15K service on my '85 300D: Oil
change, all filters, adjust valves, check timing chain, and a diesel purge.
The valves were spot on, so just a check no adjustment, the timing chain
was 5* off, which can start causing timing issues, though not an
emergency according to Kent at Mercedes Source. I'll plan to replace the
chain next year.
Anyone change a timing chain yet?
Mercedes Source has this video on how to check:
How to Check Internal Engine Timing to Determine Timing Chain Stretch
https://www.youtube.com/watch?v=k1Hlul4tIPs
I noticed the 'Accelerator Linkage Mount,' on the firewall, was loose
inside and the inner ball was crumbling, so I glued it back together for
now, and ordered a new one from FCP Euro. I called the Mb Classic
center, and heard that MB discontinued this part, though there's still
some for sale out there. If yours is questionable, you might want to
replace it.
Rob
Garden Grove
'85 300D CA
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Kinda quiet on our MB e-list.
I finally got some time to do the MB 15K service on my '85 300D: Oil
change, all filters, adjust valves, check timing chain, and a diesel purge.
The valves were spot on, so just a check no adjustment, the timing chain
was 5* off, which can start causing timing issues, though not an
emergency according to Kent at Mercedes Source. I'll plan to replace the
chain next year.
Anyone change a timing chain yet?
Mercedes Source has this video on how to check:
How to Check Internal Engine Timing to Determine Timing Chain Stretch
https://www.youtube.com/watch?v=k1Hlul4tIPs
I noticed the 'Accelerator Linkage Mount,' on the firewall, was loose
inside and the inner ball was crumbling, so I glued it back together for
now, and ordered a new one from FCP Euro. I called the Mb Classic
center, and heard that MB discontinued this part, though there's still
some for sale out there. If yours is questionable, you might want to
replace it.
Rob
Garden Grove
'85 300D CA
What is your total mileage?
-- Mark L. Bardenwerper, Sr. Technology...responsibly, thoughtfully http://citroen.cappyfabrics.com
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