Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Vintage Mercedes Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-26-2004, 01:23 PM
Registered User
 
Join Date: Nov 2003
Location: CA
Posts: 90
Looking for how-to on cleaning dist. injector points on a 4.5

My 4.5 280sel is running worse and worse and abotu all I have left to try is new fule system parts [injectors, regulator or pump] OR clean the distributer contacts. I think I'll opt for cleaning the contacts.

I have seen many posts refer to cleaning the contacts but not how to remove the dist. and disasemble.

Any suggestions? Is it documented anywhere?

Thanks ever so much, sorry to be a pain.

Oh and for those time-valve people who say its not worth it to repair the stock exhaust, I'm having that done latter this week. I'll stand corrected if need be but I hope its for the best! I'm having two oval mufflers mounted verticly [so they can fit next to eachother, one for each bank of cylinders. Look for furthur posts which will include pics

Reply With Quote
  #2  
Old 01-26-2004, 01:39 PM
Tomguy's Avatar
Vintage Moderator
 
Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,407
You have to remove the trigger point wiring harness, distributor cap, and then the set screw (the one that you loosen to adjust the timing). Either remember where the rotor was or mark its position. Make sure it's as far CCW as it will turn (not advanced). Then pull the wire for the points, and remove the other end (w/the plastic, the piece that goes in the dizzy). Then it just pulls straight out. There are 2 slotted screws that hold the trigger point unit in - take them out and it pulls striaght out. DO NOT SAND THEM, use a light tissue paper or something to absorb oil if there's a lot, and then run a business card or other stiff paper between the points (while squeezing them closed lightly). That's about it! Do the same thing with the breaker points too. Don't oil anything (except maybe a drop in the tip of the rotor recess - not the plastic rotor itself, but the metal rotor shaft, there's a felt pad inside, or was at one point - mine was a rusty rock!).
__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k
Reply With Quote
  #3  
Old 01-26-2004, 02:06 PM
Registered User
 
Join Date: Nov 2002
Location: Tucson, AZ
Posts: 306
BoneStock, a word regarding your new exhaust system. The MB stock muffler allows exhaust scavenging by effectively having a crossover pipe inside the muffler. By ommiting this you will detune the exhaust system. I forget which way it goes but the further back you move the crossover the more you move the torgue/horsepower band. Also, on a well designed engine, the intake tuning and the exhaust tunning are optimized for that engine.

If I remember correctly (it's been a long time), on my race engines I had the crossover at the extreme end of the pipes and raised the carb runners accordingly. There are some math table for doing all of this. This moved my torque and HP up to the high end of my operating rpm (10,000). Granted, they were rotary engines but the same principle applies.

Now it's starting to come back to me, you'll notice american V8's of that vintage always had the crossover right behind the maniflolds as they typically were high torque, low rpm engines.
__________________
Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)
Reply With Quote
  #4  
Old 01-26-2004, 02:48 PM
Registered User
 
Join Date: Nov 2003
Location: CA
Posts: 90
Arrow

Thanks both for your input.

Litton:

Would a 2 in 1 out muffler acomplish the cross over effect the stock setup has? I didn't realise that there was any benefit of having a crossover pipe/mufler that far back in the system [which is why I asumed seperating each bank of cylinders was ok] thanks for educating me.
Reply With Quote
  #5  
Old 01-26-2004, 10:05 PM
Registered User
 
Join Date: Nov 2002
Location: Tucson, AZ
Posts: 306
I just realized that I may have misunderstood you and forgot that there are two mufflers, or one muffler and one resonator to be correct. I was referring to the front muffler, or resonator, or which ever it is. I have no idea if the rear one is part of the exhaust tuning or not. MB engineers are a cut above normal folk.

Best guess in that a 2 into 1 would work just fine as long as the outlet area meets or exceeds the stock area. I suspect that MB didn't want the larger diameter pipe for clearance/aesthetics/etc. There is somthing else that I don't remember and that has to do with the velocity of exhaust gas but that was a fine point. If memory serves, and may have had more to do with intake tuning.
__________________
Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)
Reply With Quote
  #6  
Old 01-27-2004, 11:43 AM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Make sure you put the mufller with crossover, whatever you decide to use, in the same spot as the original muffler. May play merry hell with the power curve if you don't.

By the time you get done messing about with this, either a TimeValve or stock exhaust will be cheaper.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
  #7  
Old 01-27-2004, 04:49 PM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
For whatever reason, the six cylinder W108 has the identical exhaust except for header pipes -- the V8 is a bit larger diameter, I think. Who knows why, but MB has been partial to dual pipe/single muffler exhausts. My 300D has dual out pipes/single downpipe. The TE has dual headers into a single muffler.

I presume this is for tuning purposes, and plan to leave mine alone -- unlike American manufacturers, the exhaust isn't just stuffed under the car more or less carelessly, and they are definitely tuned for high rpm performance. Less grunt off the line, better performance (and milage) at speed.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
  #8  
Old 01-27-2004, 08:14 PM
Registered User
 
Join Date: May 2003
Location: Austin, Tx
Posts: 439
If you can stick with the original exhaust do it. I had hell with my timevalve system, they use their 4.5 system for ALL of the 4.5 cars. Perhaps if I had removed their resonator and replaced it with an open exhause I would have been OK. I had a "custom" system made here in Austin and now works fine. Mine is a 300SEL 4.5. Good luck.
Reply With Quote
  #9  
Old 01-27-2004, 08:40 PM
Tomguy's Avatar
Vintage Moderator
 
Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,407
Quote:
Originally posted by psfred
For whatever reason, the six cylinder W108 has the identical exhaust except for header pipes -- the V8 is a bit larger diameter, I think. Who knows why, but MB has been partial to dual pipe/single muffler exhausts. My 300D has dual out pipes/single downpipe. The TE has dual headers into a single muffler.

I presume this is for tuning purposes, and plan to leave mine alone -- unlike American manufacturers, the exhaust isn't just stuffed under the car more or less carelessly, and they are definitely tuned for high rpm performance. Less grunt off the line, better performance (and milage) at speed.

Peter
Actually, the 108/109's 6-cyl used a different first muffler (according to my 108 chassis parts book, and the 6-cyl 108 I saw in the junkyard) - it looks to be about 2/3 the size. The rear one is the same though.

__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:14 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page