|
|
|
#1
|
|||
|
|||
tracking down turbo drain oil leak
hi folks, i (we) have been slowly leaking motor oil down the outside of the turbo oil drain. first i just tightened the drain bolts - no change. today i removed and cleaned the drain tube and replaced the drain gasket - no change. so... what else could it be? a pinhole leak in the hard line? any suggestions, i will check out right away! thanks.
__________________
'77 240D, 504H, OM617.952, etc. |
#2
|
|||
|
|||
Your first problem is that your engine is WAY TOO CLEAN.....
It certainly could be a pin hole at the junction... might try cleaning it and scuffing it with sandpaper around that junction the last thing at night... and put a bead of red silicone high temp around it... let it cure overnight...
__________________
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/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#3
|
|||
|
|||
i stared at the picture for a little while. isn't that the pinhole right there?! mystery solved! thanks!
__________________
'77 240D, 504H, OM617.952, etc. Last edited by bricktron; 08-20-2014 at 07:55 PM. |
#4
|
|||
|
|||
does anyone have a spare one of these hard lines around? i may try to have it welded tomorrow - but dubious on whether that is practical.
__________________
'77 240D, 504H, OM617.952, etc. |
#5
|
|||
|
|||
If you clean it well...
I would suggest brazing that hole...
__________________
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/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#6
|
|||
|
|||
thanks leathermang.
i removed the pipe again, cleaned it again, and there is no hole where i thought i saw one! however, there is a fracture all the way around. that dark stain i couldn't remove may be evidence of a previous fix to this part. of course it had to be a california-specific part to go down - i actually have one of the federal ones here to compare. i was going to use the high-temperature JB weld on the pinhole but now i'm thinking hard about taking it to a welding shop.
__________________
'77 240D, 504H, OM617.952, etc. |
#7
|
||||
|
||||
Quote:
__________________
Current Stable
|
#8
|
||||
|
||||
If its fractured all the way around I would re-braze the line or replace it entirely.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#9
|
|||
|
|||
Glad I saw this, my engine leaks oil from around there and I was terrified it might be leaking from a turbo gasket but with how clean yours is... i think maybe it could be leaking from the drain.
|
#10
|
||||
|
||||
I like brazing too, but if JBWeld works as well? I'd go that route.
|
#11
|
|||
|
|||
For whatever fix is used... the most important thing is to determine what caused it.. like some support rod missing..... and fix that....
__________________
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/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#12
|
|||
|
|||
it's a reasonable question, leathermang. the turbo should never move relative to the sump, so i'm not sure why there would be any stress on this pipe. this example looks like it had been repaired (i think silver soldered) before.
__________________
'77 240D, 504H, OM617.952, etc. |
#13
|
|||
|
|||
i wasn't convinced the JB weld would hold and i really wanted to put this to bed, so i took the pipe to Cantwell in San Bruno. the boss recommended brazing a fillet of silicone-bronze between the pipe (0.5mm wall thickness) and the relatively heavy flange. this work cost $40.
__________________
'77 240D, 504H, OM617.952, etc. |
#14
|
||||
|
||||
Quote:
|
#15
|
|||
|
|||
great work it may have been, but the line is leaking again. i think leathermang was right that there's a support bracket missing. i have never seen an original 85 CA install from below, and of course i have deleted the trap ox, but the test pipe did come with a small 90 degree tab on it, never attached to anything - which i removed to access the bolt behind it. nonetheless, i can see how to easily make a small bracket to support the underside of the turbo assembly, and fix this hard line again.
but: the turbo is solidly on the motor, nothing loose. i understand that the turbo oil inlet pipe is restrictive so that the much wider drain pipe contains mostly air at a very low pressure. what about cutting the federal drain pipe for its flange and hose clamping a mostly vertical length of very high-temp, oil-rated hose instead? that way the weight of the turbo would have nothing to break. i haven't measured the temperature of the oil drain after a hard run yet. perhaps no such hose exists.
__________________
'77 240D, 504H, OM617.952, etc. |
Bookmarks |
|
|