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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-18-2006, 06:08 PM
Registered User
 
Join Date: Sep 1999
Location: USA
Posts: 338
350SDL Valve Job....cost and time.....

I'm having the head gasket replaced on my 1991 350SDL with 177K miles on it.

I'm interested in estimates on what you might think a valve job might add to the cost of the head gasket replacement job?

PLEASE don't clutter this thread with comments about the rod problems with this engine. I have read every thread on this forum regarding the rod problem already.

Thank you.

Reply With Quote
  #2  
Old 02-18-2006, 06:10 PM
Registered User
 
Join Date: Dec 2004
Posts: 554
est

2k min
Reply With Quote
  #3  
Old 02-18-2006, 08:38 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
Talk to Metric, I wouldn't bother letting anyone else play with one of these.

It depends what is out of spec; it may just need new valve seats and seals. Or the prechambers, intake and exhuast valves could be out of spec. The cam is probably fine, I'd check the chain for stretch and probably replace the tensioner and guides.

I'd guess $1k-$2k.
__________________
2020 GMC Sierra Denali
2007 Tiara 3200
Reply With Quote
  #4  
Old 02-18-2006, 11:53 PM
Registered User
 
Join Date: Sep 1999
Location: USA
Posts: 338
350SDL Engine - How Many Miles Before Needing A Valve Job?

Can anyone who has first hand knowledge of the 350SDL engine comment on how many miles these engines can go before requiring a valve job?

I'm having the head gasket replaced on a 177K mile engine and I'm trying to determine if I need or should do a valve job at the same time?

PLEASE don't clutter this thread with comments pertaining to the rod problem with these engines. I am well aware of that problem and have read all the threads on this forum regarding that.

Thank you.
Reply With Quote
  #5  
Old 02-19-2006, 12:05 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,298
on my

90 350 with 132k when doing the head gasket we found worn valves and guides. cant remember about the springs, maybe them too. the lifters were fine. the intake ports were about 90% plugged with tar. ran like a different car when done.

r and r of head was about 800 head work about the same i think. aboout one year ago shop rate 55.

tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #6  
Old 02-19-2006, 01:11 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
Their is really no way to know. My 603 has the same head as yours and has 254k without a valve job.

The only way to know if your engine needs a valve job is to have the valves measured for wear. Don't forget the balls get lose in the prechambers as well.


Will they run a very long time with worn valves ect? Of course for many years and hundreds of thousands of miles.

You could bolt your head right back on and run it for many more years without needing any work. Heck you will probably sell it before that point. The real queston is how much better will the engine run with a tight upper end.
__________________
2020 GMC Sierra Denali
2007 Tiara 3200
Reply With Quote
  #7  
Old 02-19-2006, 01:27 PM
Registered User
 
Join Date: Sep 1999
Location: USA
Posts: 338
Quote:
Originally Posted by Hatterasguy
Their is really no way to know. My 603 has the same head as yours and has 254k without a valve job.

The only way to know if your engine needs a valve job is to have the valves measured for wear. Don't forget the balls get lose in the prechambers as well.


Will they run a very long time with worn valves ect? Of course for many years and hundreds of thousands of miles.

You could bolt your head right back on and run it for many more years without needing any work. Heck you will probably sell it before that point. The real queston is how much better will the engine run with a tight upper end.
My mechanic tends to be the "if it ain't broke, don't fix it" kind. I just wanted to explore the wisdom of doing a valve job once the head was off anyway. Still not sure which way to go?

Thank you.
Reply With Quote
  #8  
Old 02-19-2006, 01:47 PM
Anthony Cerami's Avatar
Registered User
 
Join Date: Aug 2003
Location: South Jersey
Posts: 304
valve job

E-Z
valve job ................
In my opinion, I would think that $2000.00 or so should cover it. That seems reasonable to me.
My 91 350SD has about 145,000 miles on it.
I have done quite a bit of work since I aquired it.
Re-sealed the IP..
Calibrated the injectors..
Set the timing..
Replaced the fuel lines...
When I replaced the valve cover gasket. I removed the camshaft to inspect the Valves and to install valve seals. I discovered that one of the valve guides had slid down in the head. The valve guides are in need of replacing.
So to answer you question .... Yes its time for a valve job. I would also recomend new lifters ... (about $200.00) the new design allows more oil flow.
They also have a square relief ground into the side. The old design has a round hole.
I think a valve job and a good maintanance program will give you many more years of service on this engine.
Reply With Quote
  #9  
Old 02-19-2006, 03:24 PM
Registered User
 
Join Date: Sep 1999
Location: USA
Posts: 338
Quote:
Originally Posted by Anthony Cerami
E-Z
valve job ................
In my opinion, I would think that $2000.00 or so should cover it. That seems reasonable to me.
My 91 350SD has about 145,000 miles on it.
I have done quite a bit of work since I aquired it.
Re-sealed the IP..
Calibrated the injectors..
Set the timing..
Replaced the fuel lines...
When I replaced the valve cover gasket. I removed the camshaft to inspect the Valves and to install valve seals. I discovered that one of the valve guides had slid down in the head. The valve guides are in need of replacing.
So to answer you question .... Yes its time for a valve job. I would also recomend new lifters ... (about $200.00) the new design allows more oil flow.
They also have a square relief ground into the side. The old design has a round hole.
I think a valve job and a good maintanance program will give you many more years of service on this engine.
Just to be clear, are you saying that the valve job should cost me around $2,000 over and above the $1,800 - 2,400 that I've been quoted for the head gasket and timing chain replacement.

Thank you.
Reply With Quote
  #10  
Old 02-19-2006, 06:04 PM
Registered User
 
Join Date: Jul 2002
Location: S. Texas
Posts: 1,237
ezroder,

You are headed for the classic MAW (might as well) situation. You've got the head off you might as well do the chain and guides. Then you MAW do this and MAW do that. Again, don't pass us needed work in fear of a MAW situation. You will never be in a better do do some of this work than when you have the head off.
Reply With Quote
  #11  
Old 02-19-2006, 10:37 PM
Anthony Cerami's Avatar
Registered User
 
Join Date: Aug 2003
Location: South Jersey
Posts: 304
cost

E-Z
Ok ...well it depends what you want to do. Valve job, lifters, timing chain, Ching -Ching........is the shop $95, $105 an hour. What are the times...8.5 hours for labor plus parts......If you claim you can get it done for $2000.00 thats a great price. Guides, seals, chain, gasket ,Valve grind, and yes while your in there.......
OR........
Pull the head, replace the valve seals, new head gasket......ship it!
Wait a month .......if its still runing good fish in a new timing chain ......!
Reply With Quote
  #12  
Old 02-19-2006, 10:42 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,298
no

i would not think the head work would be that much. 800 to 1200 max, i would think. depending on the condition.

you are already paying for the r and r.

tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #13  
Old 02-19-2006, 10:58 PM
Registered User
 
Join Date: Sep 1999
Location: USA
Posts: 338
Are the injectors usually removed for a head gasket replacement?

Should a compression test be done to determine if a valve job is needed?

How much time is involved to do a compression test?

Shop has quoted me 11 hours to do the head gasket replacement.

Thank you.
Reply With Quote
  #14  
Old 02-20-2006, 12:26 AM
Anthony Cerami's Avatar
Registered User
 
Join Date: Aug 2003
Location: South Jersey
Posts: 304
11 hours..

Ok so they want $1000 labor .....$1000 in parts.
How much do you want to spend? ...or need to spend....
No.you dont need to remove the injectors. But again now would be the time ...soak then in carb cleaner ...calibrate them ...new sealing rings etc
Injectors and timing ....critical for Diesel performance ...................
This is a very intracate engine after all it is a Mercedes!
Believe me, when this thing is set up right .... it really runs!
First check the timing chain strech.......Do you need to replace it now?
177,000 Mi ....was it changed before? if not, it might be time.
A compression test would be the next step.
... My compression tool connects to the glow plug hole..
You need to remove the intake to do it......
I dont know of a tool that fits the injector hole...
Evaluate it from that point....
Even compression = very good
Next ...Pull the head....you need to fix the leak...
Pulling the head will tell a whole lot more about the condition of the engine...
Check the cylinders....How do they look ? Is there a ridge on the upper cylinder wall.....?? Do you see "scuff marks" in the cylinders? Than maybe just valve seals and a gasket and drive it ....
Evaluate it from that point....
As you answer each question that will determin how far need to go.
Good compression...Can you still see the factory cross-hatch...thats a very good sign....
If the cylinders show little wear then GO FOR IT! Complete valve job, chain, new lifters, etc.
Discuss in detail with your man BEFORE you tear it down.
Note: This camshaft is hollow ...so there is a special procedure to remove and install it.
It can break like a piece of glass.
Again... Ez... It depends on the car..... it it really nice?
Do you enjoy driving it?
I did lots of work to my 91 350SD ..... I drive and enjoy it! Not to mention it always get a trophy at the car shows .....

Last edited by Anthony Cerami; 02-20-2006 at 12:48 AM.
Reply With Quote
  #15  
Old 02-20-2006, 09:28 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,298
good advice

my compression tester didnt come with the proper adaptor for the 603 so i had my machinist make one from a spare injector.

tom w

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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 08:25 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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