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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-17-2009, 12:05 PM
hsahai's Avatar
Registered User
 
Join Date: Nov 2008
Location: Gainesville Virginia
Posts: 37
"Mr. Timing Chain Duplex" New Patient for you

Patient Name- Mr. Timing Chain Duplex
Age- 20Years Sex- Male or female –you decide
Address- W-126, V 8, 5.6L
560 sel MB 1988
Reason for visit- 100,000 miles checkup.

Chief complaints- None. Current mileage- 220,000 miles

Present History.- Never checked myself before. Running fine just like new.
Past History- I don’t know. Single owner before, Now second owner. No major break down. All the previous record available but no mention about myself.
Review of systems questionnaires-

1- Do you take 4-5 crank attempt to start the engine?—No
2- Hard starting?- No
3- Do you make flapping sound for few seconds soon after engine start.?--No
4- Are you making flapping sound all the time when engine running? No

Physical Examination- Not done- Need surgery to check ( Removal of valve cover to check chain stretch)

Diagnosis- Suspected timing chain stretch to a point that it can break. Needs to be confirm by Timing chain stretch test.

Management- Heart Attack ( Broken timing chain, bent valves damage pistons) can happen without sign and symptoms. We’ll do following surgery and replace following organs ( Organ transplant- cloned in lab- New? or From another person- Junk yard.?)

1- Timing chain
2- Camshaft gears
3- Upper timing chain guide
4- Tiiming chain tensioner and gasket
5- You fill in rest.

Operation theater- DIY

Surgery scheduled-

Timing chain and chain guide/rail replacement.

1- Remove both air cleaner hoses, air cleaner intake snorkel.
2- Drain radiator, remove upper and lower radiator hoses, transmission lines to radiator and remove fan shroud and radiator
3- Remove Fan and fan clutch from water pump.
4- Remove all the drive belts.
5- Remove alternator and alternator bracket.
6- Remove steering pump and set aside, don’t remove it completely.
7- Remove steering pump bracket.
8- Remove distributor, spark plug wires and spark plugs.
9- Remove both side valve covers.
10- Rotate the crank shaft clockwise to match the mark of camshaft gear with the mark of the camshaft tower. And check the mark on the camshaft mark to confirm the timing chain stretch, If timing chain needs to be replaced. Proceed with following.
11- Remove upper chain guides/rails on both side. Remove chain tensioner and tensioner rail. Install tensioner with new gasket and install all the upper new chain guides. These steps should be done before reeling in new timing chain.
12- Reel in new timing chain. There are more then one method of reeling in timing chain. Three Vice grips method or using special tool for timing chain installation.
13- Rest of the reinstallation is in reverse order.

Precautions-

1- Mark the distributor and engine housing to reinstall the distributor at the same position.
2- Timing marks on the camshaft, camshaft towers and crankshaft should be in alignment with their respective marks.
3- Cylinder # 1 should be at TDC.
4- Rotate crankshaft only in clockwise direction.
5- Distributor rotor should be in alignment with the # 1 sparkplug wire contact point of the distributor.

Potential complications

1- Jumping 1 or 2 teeth of camshaft gear or crankshaft gear.
2- Dropping chain inside the engine.
3- Timing chain stuck inside and crankshaft can not be rotated.
You can recover from these mistakes but it is more complicated and time consuming..

AFTER LEARING ALL OF THESE, I HAVE SECOND THOUGHT.

SECOND OPINION FROM ANOTTHER SURGEON.

1- Why not remove the Timing chain cover from the front of the engine to get the full view of the all the gears, all timing chain guides and rails including chain tensioner and everything else. Once I get to that point I may not have deal with above potential complications and some of those precautions since everything is in front of me. It is my feeling that once everything is open to me the timing chain job should be easy to do.
2- Why I feel that way-
a. I recently replaced the timing belt from V-6 engine of Isuzu Rodeo. After taking upper and lower timing belt cover off from front of the engine. Whole timing belt job was very easy. But it was timing belt not timing chain. And it was non interference engine.

CONFUSIONS-

1- I have searched many forums but could not find detail information about removal and installation of the timing chain cover to do the timing chain job.
2- I have w126 service cds and WIS dvds software on my computer and I consulted them too. The descriptions are not in detail and sometimes not clear to me.

CASE IS REFFERED TO SPACIALIST( Dr. You Guys)

MY QUESTIONS ARE-

1- Why most of us do not go that rout and do the timing chain job after removing the front timing chain cover?
2- How many of you have done timing chain job after removing front timing chain cover.? And what is your experience and recommendations?

3- Please fill in—

a. Expected number of hrs. to complete the job?
b. Minimum tools required for DIY?
c. What parts and gaskets are needed to complete the job?
d. Can I do it alone?
e. List of other jobs “while you are there”? Although I don’t like these jobs unless something is broken.


So, How should we treat this Patient.

Reply With Quote
  #2  
Old 05-17-2009, 12:52 PM
Senior Member
 
Join Date: Nov 2002
Posts: 829
not sure if i can answer everything and in order you posted but, here goes. you need valve cover gaskets, oil tube kits for both heads, chain, oe tensioner, tens. rail, 3 upper rails, 2 cam gears, oil and filter. consider replacing the fan belts, plugs, coolant and radiator hoses. maybe, the water pump. only if it's a suspect in a coolant loss problem. if you have broken rails, the you need the oil pan gasket and the rubber foot for the oil pump. the pan needs to come off to find all the pieces broken from the rails. had 1 car come in as a tow-in. just bought it, 300 miles on it, quit running. chain jumped, bent valves. rails were intact and the chain was fresh. BUT, it was just done before sold and the broken bits were still in the engine. 1 got wedged in the chain and caused the damage. the rubber foot gets hard and you should pull it off to make sure nothing is sitting in the oil pump pickup, waiting to lock up the oil pump.

pulling the front cover is easier with the heads off, obviously. i don't suggest it with the heads on and the mileage you post as it's a serious pita. if you get to 300k or so, the pull the cover and replace the 2 lower guides along with the oil pump chain and guide. i've had the cover off of 1 in the many years i've been doing this. the reason was because 1 of the water pump bolts had been stripped during replacement by someone a long time before i got the car. this 1 bolt is long enough to thread into the block. the heads had to come off because of a required valve job for loose valve guides. more stripped bolts-long story.

nothing special required in tools, except for the rail pin puller. socket to turn the motor, spark plug socket, etc. the rail pins can be pulled with a 6mm bolt and a socket big enough for the pin to fit into as it comes out of the cover. some people pull the rockers to relieve compression, i pull the plugs. had a couple of cars where the lifters acted up when reloaded with the rocker and had to be adjusted or replaced. so, i stopped pulling the rockers.

hth, good luck, chuck.
Reply With Quote
  #3  
Old 05-17-2009, 10:58 PM
hsahai's Avatar
Registered User
 
Join Date: Nov 2008
Location: Gainesville Virginia
Posts: 37
Thanks Mr. Porkface. for your valuable suggession.
Reply With Quote
  #4  
Old 05-17-2009, 11:00 PM
hsahai's Avatar
Registered User
 
Join Date: Nov 2008
Location: Gainesville Virginia
Posts: 37
Where is Mr. Aurther Dalton? We need your expert advice Mr. Aurther?

Sahai
Reply With Quote
  #5  
Old 05-18-2009, 01:44 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
the easiest and safest way to do this job is to pull all the rockers and spark plugs.then you can screw up and still correct your mistake without causing a heart attack.

__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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 03:13 AM.


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