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 07-07-2018, 12:25 AM
Registered User
 
Join Date: Jul 2018
Posts: 2
Diagnosing om617 Toyota Swap Problem

Hey folks,
First time posting but used this forum countless times during my swap...thanks for the help.
1986 Toyota 4Runner with a 1985 om617.952 swap.
I値l cut to the chase. Swap is done, but I知 having overheating and white exhaust smoke issues. White smoke at start which gradually decreases as motor warms up. Idles fine for as long as I want with no cooling issues. However inclines are a huge issue at low and high speeds, white smoke gets bad and engine will rapidly start to heat up. I always lay off before it gets out of control. Smoke gets bad before the engine temp ever gets to 200*f
Overheating issues aside, the white smoke concerns me the most. All the research I致e done seems to point to a head gasket but there is no noticeable oil in the coolant or milkshake in the oil pan. Again, I知 not as concerned about the overheating since if it is a simple cooling issue I will upgrade the radiator and fan. I知 more worried that the overheating is a product of a head gasket problem.
I知 admittedly not very well versed in diesel motors, so I am wondering what sort of things I can do to narrow down the problem. I love this truck but this has been an absolute nightmare. Basically a paper weight right now since I don稚 want to get stranded in the woods with no cell service.
Any suggestions would be greatly appreciated.
Reply With Quote
  #2  
Old 07-09-2018, 05:36 PM
WTB: 94/95 E320 Wagon
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,456
If you didn't swap over the MB radiator to go with the diesel engine, I'd say you need to probably take a hard look at that, you need to make sure what ever radiator you have is up to the task. Easiest way is to use the MB radiator, just a matter of fitting that into the truck.

Replace the thermostat and the gasket, they cost about $20 or so. Be sure to check the old and new thermostats in a pan of water on the stove to make sure they open at correct temperature and reach full stroke by correct temperature.

Did you change the injection pump timing at all? Getting the timing off can lead to the white smoke and may also be related to the over heating.

What does the white smoke smell like? Sweet smell = coolant, unburnt diesel smell = injection problem (timing or bad injector(s)).
__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
'73 Balboa 20 "Sanctification"
Charleston SC
Reply With Quote
  #3  
Old 07-09-2018, 07:55 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 3,897
White smoke + overheating strongly suggests timing problems. Late/retarded injection will cause white acrid smoke (it'll sting your eyes) and have a foul smell. It will also cause excessively high EGT's and overheating from lugging the engine.
__________________
'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'86 300SDL - "The Diseasel" 186K
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Reply With Quote
  #4  
Old 07-09-2018, 08:43 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 24,143
If the smoke smells like raw fuel that is an indication of late timing or for some other reason the fuel is being atomized but not burning.

Put a piece of cardboards or board near the exhaust and remove it so you can smell it.

Note that it has happened before that people have acquired Engines that were not in good shape for transplants.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #5  
Old 07-09-2018, 10:47 PM
Mad Scientist
 
Join Date: Dec 2012
Location: Oregon
Posts: 1,361
No input beyond what's already been added, smell the smoke to help narrow things down.

Good luck. Went through quite a hassle getting my swap ironed out myself - it was well worth it in the end.
__________________
1990 617 swapped Toyota Pickup 4x4, 22-24 MPG, 44k miles on swap
Reply With Quote
  #6  
Old 07-10-2018, 09:21 AM
Registered User
 
Join Date: Jan 2018
Posts: 226
Sounds like a coolant leak into the intake. Smoke on start as it seeps in and puddles overnight. White smoke and overheating as it gets under load and the system pressurizes. Put a cooling system pressure check on it.
Reply With Quote
  #7  
Old 07-10-2018, 11:23 AM
Mad Scientist
 
Join Date: Dec 2012
Location: Oregon
Posts: 1,361
Please explain the path the coolant takes to get into the intake on a 617.
__________________
1990 617 swapped Toyota Pickup 4x4, 22-24 MPG, 44k miles on swap
Reply With Quote
  #8  
Old 07-10-2018, 11:35 AM
ROLLGUY's Avatar
ROLLGUY
 
Join Date: Oct 2007
Posts: 5,804
Quote:
Originally Posted by OM617YOTA View Post
Please explain the path the coolant takes to get into the intake on a 617.
The only possible way I can think of is through the head gasket, or a crack in the head. It is not possible to get coolant in the "intake" side of the valves, only the combustion side.
Reply With Quote
  #9  
Old 07-10-2018, 12:05 PM
Registered User
 
Join Date: Jan 2018
Posts: 226
Yup, cracked head, bad gasket or even the block. Not necessarily in the intake manifold per se, but getting in the comvustion chamber. Have seen a Honda with a vertical crack in a cylinder wall years ago. Crack was low enough that the piston still sealed off during high compression and combustion, but picked up coolant on the intake stroke.
Reply With Quote
  #10  
Old 08-06-2018, 02:46 PM
Registered User
 
Join Date: Jul 2018
Posts: 2
Thanks for all the replies.

Quote:
Originally Posted by Diseasel300 View Post
White smoke + overheating strongly suggests timing problems. Late/retarded injection will cause white acrid smoke (it'll sting your eyes) and have a foul smell. It will also cause excessively high EGT's and overheating from lugging the engine.
It's never stung my eyes but it certainly doesn't smell sweet. Definitely smells more like fuel

Quote:
Originally Posted by Diesel911 View Post
If the smoke smells like raw fuel that is an indication of late timing or for some other reason the fuel is being atomized but not burning.

Put a piece of cardboards or board near the exhaust and remove it so you can smell it.

Note that it has happened before that people have acquired Engines that were not in good shape for transplants.
I will try the cardboard trick...seems like a better idea than sticking my nose in the exhaust pipe.

Quote:
Originally Posted by OM617YOTA View Post
No input beyond what's already been added, smell the smoke to help narrow things down.

Good luck. Went through quite a hassle getting my swap ironed out myself - it was well worth it in the end.
Thanks. I've referenced many of your previous posts throughout my swap.

Quote:
Originally Posted by Maxbumpo View Post
If you didn't swap over the MB radiator to go with the diesel engine, I'd say you need to probably take a hard look at that, you need to make sure what ever radiator you have is up to the task. Easiest way is to use the MB radiator, just a matter of fitting that into the truck.

Replace the thermostat and the gasket, they cost about $20 or so. Be sure to check the old and new thermostats in a pan of water on the stove to make sure they open at correct temperature and reach full stroke by correct temperature.

Did you change the injection pump timing at all? Getting the timing off can lead to the white smoke and may also be related to the over heating.

What does the white smoke smell like? Sweet smell = coolant, unburnt diesel smell = injection problem (timing or bad injector(s)).
I used the MB radiator for the swap. Fitting it in was no fun. Radiator support, meet angle grinder.

Tested the thermostat and is works fine.

Injection timing was adjusted by the previous owner so I have to do some more research to figure out how to mess with that.

Quote:
Originally Posted by MCallahan View Post
Sounds like a coolant leak into the intake. Smoke on start as it seeps in and puddles overnight. White smoke and overheating as it gets under load and the system pressurizes. Put a cooling system pressure check on it.
That is my concern. Time to do a pressure check
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 05:41 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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