Adjusting valves - Nut bottoms out
Adjusting valves - Nut bottoms out
11-07-2010, 01:58 PM
#1
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
Is it possible for the valve adjustment nut to bottom out? I'm adjusting my valves and it feels like the top nut has bottomed out against the valve stem. The middle nut is loose, and trying to tighten the top one makes the large nut against the spring turn. Is it time to swap my new engine in soon?
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
11-07-2010, 04:29 PM
#2
This post was last modified: 11-07-2010, 04:37 PM by Biohazard.
82 300SD aka The Flyin Pumpkin (Gone): 7.5mm super M-pump, T3 60 trim turbo, Coldish air intake, A/W intercooler, propane injection, SW Boost and EGT gauges, Monark 265 nozzles, ported/polished cylinder head.
84 Euro 300D 4 sp: White with black trunk and hood. Blue cloth interior. Manual everything. 300DT front swaybar. C320 17" wheels. Now with the Flyin Pumpkins engine!
The rocker will actually have more than 1/8th inch gap if it is all the way down. I ran all of mine down when I was swapping the cylinder head to make it easier to get the rockers in and out. Try holding the large hex spring retainer in place with your hands, or a cresent wrench. Sometimes the lock nut or the top nut get buggered up around the threads from being adjusted so many times.
82 300SD aka The Flyin Pumpkin (Gone): 7.5mm super M-pump, T3 60 trim turbo, Coldish air intake, A/W intercooler, propane injection, SW Boost and EGT gauges, Monark 265 nozzles, ported/polished cylinder head.
84 Euro 300D 4 sp: White with black trunk and hood. Blue cloth interior. Manual everything. 300DT front swaybar. C320 17" wheels. Now with the Flyin Pumpkins engine!
11-08-2010, 12:58 AM
#3
Thats why there is a third wrench.
ForcedInduction
11-08-2010, 12:58 AM
#3
The collar is not adjustable, its only job is to keep the spring attached to the valve. It spins because the valve rotates as the engines running. Only the top two nuts are adjustable.
Thats why there is a third wrench.
11-08-2010, 07:47 AM
#4
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
A large wrench placed between the cam towers and the spring valve nut will keep it from turning (much). Those rotocaps should be replaced occasionally...
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
11-08-2010, 02:01 PM
#5
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
I'll give it another try, but I clamped the large nut with vise grips and it still didn't want to move. Is it 25mm? I need to find something that will fit in there, the one thats stuck is the exhaust valve on cyl #5, too tight to fit my adjustable wrench.
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
11-08-2010, 05:08 PM
#6
(11-08-2010, 02:01 PM)300SD81 I clamped the large nut with vise grips and it still didn't want to move.
I cringed...
I'll be doing valves on my 617 soon, so this is all good to know for me.
1990 Power Ram 50 V6 SOHC 24V 6g72
I can be wrong, don't take everything I say as verbatim, please fact-check first.
My posts are my personal opinions and thoughts, unless otherwise noted.
(11-08-2010, 02:01 PM)300SD81 I clamped the large nut with vise grips and it still didn't want to move.
I cringed...
I'll be doing valves on my 617 soon, so this is all good to know for me.
1990 Power Ram 50 V6 SOHC 24V 6g72
I can be wrong, don't take everything I say as verbatim, please fact-check first.
My posts are my personal opinions and thoughts, unless otherwise noted.
11-08-2010, 10:29 PM
#7
(11-08-2010, 02:01 PM)300SD81 I'll give it another try, but I clamped the large nut with vise grips and it still didn't want to move. Is it 25mm? I need to find something that will fit in there, the one thats stuck is the exhaust valve on cyl #5, too tight to fit my adjustable wrench.
The big one isn't supposed to move alot. Like FI said, its the retainer for the spring. The retainer has a tab that fits into a slot in the valve stem that you may or may not be able to see. The whole valve, spring, retainer, lock/top nuts, and rotater are designed to all spin a little during operation to keep from getting uneven wear on the valve and top nut. Now, if you're holding the big one steady, you should be able to move the lock nut. Those back ones are a PITA for sure, but I hope it works out for you.
82 300SD aka The Flyin Pumpkin (Gone): 7.5mm super M-pump, T3 60 trim turbo, Coldish air intake, A/W intercooler, propane injection, SW Boost and EGT gauges, Monark 265 nozzles, ported/polished cylinder head.
84 Euro 300D 4 sp: White with black trunk and hood. Blue cloth interior. Manual everything. 300DT front swaybar. C320 17" wheels. Now with the Flyin Pumpkins engine!
(11-08-2010, 02:01 PM)300SD81 I'll give it another try, but I clamped the large nut with vise grips and it still didn't want to move. Is it 25mm? I need to find something that will fit in there, the one thats stuck is the exhaust valve on cyl #5, too tight to fit my adjustable wrench.
The big one isn't supposed to move alot. Like FI said, its the retainer for the spring. The retainer has a tab that fits into a slot in the valve stem that you may or may not be able to see. The whole valve, spring, retainer, lock/top nuts, and rotater are designed to all spin a little during operation to keep from getting uneven wear on the valve and top nut. Now, if you're holding the big one steady, you should be able to move the lock nut. Those back ones are a PITA for sure, but I hope it works out for you.
82 300SD aka The Flyin Pumpkin (Gone): 7.5mm super M-pump, T3 60 trim turbo, Coldish air intake, A/W intercooler, propane injection, SW Boost and EGT gauges, Monark 265 nozzles, ported/polished cylinder head.
84 Euro 300D 4 sp: White with black trunk and hood. Blue cloth interior. Manual everything. 300DT front swaybar. C320 17" wheels. Now with the Flyin Pumpkins engine!
11-09-2010, 06:18 PM
#8
This post was last modified: 11-09-2010, 06:18 PM by 300SD81.
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
I tried to wedge a piece of metal between the big nut and the cam tower to keep it from turning, but the top nut still does not want to tighten, while the middle one is loose, and I still cannot get enough clearance on the valve. Does anyone have the proper wrench for holding the large nut? I'd be willing to pay shipping both ways and a deposit. I'm using a 3in wrench and the tips of my fingers to turn it, so its possible I'm just not getting enough leverage.
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
11-09-2010, 07:44 PM
#9
(11-09-2010, 06:18 PM)300SD81 I tried to wedge a piece of metal between the big nut and the cam tower to keep it from turning, but the top nut still does not want to tighten, while the middle one is loose, and I still cannot get enough clearance on the valve. Does anyone have the proper wrench for holding the large nut? I'd be willing to pay shipping both ways and a deposit. I'm using a 3in wrench and the tips of my fingers to turn it, so its possible I'm just not getting enough leverage.
Save yourself the time and hassle and just get new nuts. Chances are they are due anyways..
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
(11-09-2010, 06:18 PM)300SD81 I tried to wedge a piece of metal between the big nut and the cam tower to keep it from turning, but the top nut still does not want to tighten, while the middle one is loose, and I still cannot get enough clearance on the valve. Does anyone have the proper wrench for holding the large nut? I'd be willing to pay shipping both ways and a deposit. I'm using a 3in wrench and the tips of my fingers to turn it, so its possible I'm just not getting enough leverage.
Save yourself the time and hassle and just get new nuts. Chances are they are due anyways..
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
11-11-2010, 09:07 PM
#10
This post was last modified: 11-11-2010, 09:07 PM by 300SD81.
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
As in pull the timing chain, camshaft, etc? I was hoping to avoid having to do that... I'm going to the UGA/Auburn game this weekend and don't have time to do all that between classes and it gets dark way too early now... Hopefully .32mm cold is good enough on that exhaust valve, don't think it'll cause any problems since it was running ok before the adjustment when it was tighter than that. If something does happen, I'll just have to swap in my spare engine before mounting the VNT and use the current one for test fitting. It only has about 200psi compression on cyl 1 anyways so I'm gonna have to swap it sooner or later
Ich liebe meine Autos!
1981 Mercedes-Benz 300SD | 156K Miles | 2nd Owner | EGR Disabled [Removal Pending] | ALDA Removed | Straight Pipes | GT2256V??? | Laser Interceptor | Engine swap over summer, hopefully with GT2256V attached...
1981 Mercedes-Benz 300SD | Odo Stopped at 160K (at least 50K more) | EGR Disabled | ALDA All The Way Out | Straight pipes | FM-870 Remote Start Alarm System | B100 Biodiesel | AC Fixed x2 | Trunk crushed in
| Retired to garage.Excessive speeding? It ain't excessive till I redline!
11-12-2010, 03:41 PM
#11
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
No, you can pull the watchamacallies out and then pull the nut off the top of the valve. if you do this you can do the valve stem seals.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
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