|
|
|
#1
|
||||
|
||||
Valve adjustment
When adjusting the valves on a "new to you" engine , and you find they are all tight. Would it be a good idea to run the engine and then go back and readjust within a few thousand miles rather than the 15,000.
If yes how many do this and what amount of miles would be sufficient to burn off any carbon or debris on the valve seat area due to the tight valves?
__________________
Experience : what you receive 3 seconds after you really needed it !! 86 300SDL 387,000? Motor committed suicide 81 300SD 214,000 "new" 132,000 motor 83 300SD 212,000 parts car 83 300SD 147,000 91 F700 5.9 cummins 5spd eaton 298,000 66 AMC rambler American 2dr auto 108,000 95 Chevy 3/4 ton auto 160,000 03 Toyota 4runner 180,000 wifes |
#2
|
||||
|
||||
a very good idea. I would do it. and I would put less than 100 miles on and recheck. then recheck again in 250miles.
then again, if ALL the valves were tight, I'd verify I was measuring properly. the measurements go between the cam lobe and the follower. not between the follower and the valve cap. |
#3
|
||||
|
||||
yes, I checked after about 500 miles and they all needed to be readjusted. When I got my engine all of the valves were pretty much as tight as they would go, I don't think it is that unusual.
__________________
TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#4
|
|||
|
|||
I have heard of this before, but I haven't done it. I did my 240D shortly after I bought it and then again 15,000 miles later. All valves were way tight the first time. Several valves were tight the second time, but not by a whole lot. I haven't put enough miles on my 300 to need to do it a second time yet, though its time will come soon (after I get back from the sandbox next year).
__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#5
|
|||
|
|||
It is a very good idea...
but an even better idea to combine with it... is to do what the MB FSM suggests be done ' on principle' after a certain number of miles... and that is renew ( replace ) those two nuts which , when adjusted and locked together, make and KEEP your valve clearances...
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#6
|
||||
|
||||
Quote:
|
#7
|
||||
|
||||
OK
Quote:
Many customers bring neglected cars to me. If I am rushed = customer needs it back the same day: #1. Adjust the valves, take it for a 3-5 mile run in a lower gear ( Italian Tune-up links thread ) #2. Re-adjust the valves, take it for a 3-5 mile run in a lower gear ( Italian Tune-up links thread ) #3. Re-adjust the valves, take it for a 3-5 mile run in a lower gear ( Italian Tune-up links thread ) #4. Offer to re-check in a month. |
#8
|
||||
|
||||
YES
Quote:
The OM617 Upper nut is x10 per engine MB# 615 053 00 72 Fastlane: valve locking nut http://catalog.peachparts.com/item.wws?sku=6150530072 The OM617 Lower nut is x10 per engine MB# 153 990 02 51 Fastlane: http://catalog.peachparts.com/item.wws?sku=W0133-1643198 You can always call Phil with parts questions.
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ Last edited by whunter; 06-07-2011 at 03:24 PM. |
#9
|
||||
|
||||
100$ for some nuts? please
|
#10
|
|||
|
|||
where are you getting that? I see $1.94 per nut, which would be $40 for a 5 cylinder, not $100.
Edit: never mind, just saw that one of them is over $8 each.... yikes!
__________________
1976 Mercedes 240D, unknown mileage 1977 Mercedes 240D, 225k 1992 Dodge/Cummins 4WD, 284k 1990 Subaru Legacy wagon, 330k 1991 Subaru Legacy wagon, 225k |
#11
|
||||
|
||||
Where do they wear? The only thing I can see go wrong with them is they get rounded.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#12
|
||||
|
||||
This seems like a common practice. I will have to recheck mine I've put over 1000 miles on the car since doing the valves for the first time all where tight.
Where are the nuts wearing ? The threads from continuous loosening and tightening or the outer edges due to overzealous mechanics ? These are used as jamb nuts right ? The lock is when they are tightened together ?
__________________
Experience : what you receive 3 seconds after you really needed it !! 86 300SDL 387,000? Motor committed suicide 81 300SD 214,000 "new" 132,000 motor 83 300SD 212,000 parts car 83 300SD 147,000 91 F700 5.9 cummins 5spd eaton 298,000 66 AMC rambler American 2dr auto 108,000 95 Chevy 3/4 ton auto 160,000 03 Toyota 4runner 180,000 wifes |
#13
|
|||
|
|||
The internal threads due to the constant pounding of the cam shaft lobe follower.
Threads like these show how many people do not have or do not read the MB FSM..
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#14
|
|||
|
|||
Quote:
__________________
Charles 1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html |
#15
|
||||
|
||||
Quote:
Thanks ! would have never guessed that . If they stay tight you wouldn't think they would wear. (working on the FSM thing I have the 602/603 not good in this case)
__________________
Experience : what you receive 3 seconds after you really needed it !! 86 300SDL 387,000? Motor committed suicide 81 300SD 214,000 "new" 132,000 motor 83 300SD 212,000 parts car 83 300SD 147,000 91 F700 5.9 cummins 5spd eaton 298,000 66 AMC rambler American 2dr auto 108,000 95 Chevy 3/4 ton auto 160,000 03 Toyota 4runner 180,000 wifes |
Bookmarks |
|
|