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  #1  
Old 11-04-2012, 01:53 AM
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oil pump chain broke on 86 300sdl ???? how to replace it ???

the chain on the oil pump of my 86 300 sdl broke 30 seconds after i started it in my garage one morning ...... and i'll be damned if i can figure out how to replace .... and YES i did try to search for it but cant seem to find any how or dyi notes on it .....

it was running so nicely i decided to replace some minor things like hoses & belts and when i started it up this awful noise ...rattle rattle bang ... i shut it off and removed to oil pan inspection plate to find parts of the chain AND the chain laying in the btm .... i removed all the stuff i could off the front of the engine ( since i already had most of it off to change the water pump etc. ) assuming there was a cover lurking there but found nothing ....

i dont see any plate or cover you can remove to get @ the oil pump & timing chain .... how the heck do you access it ...... i sure hope i'm wrong becuz it looks like you need to remove the head and everything to get @ it ......

any ideas before i pull the rest of my hair out ...

thanks for the help .,...
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  #2  
Old 11-04-2012, 02:00 AM
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Location: MN
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Oil pressure gone to zero
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #3  
Old 11-04-2012, 11:02 AM
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nope .... link not helpful

sorry bout that ...but that link has no useful info .... does anyone know how to get access to that chain .... , ideas, schematics etc??? i need my car back and have no idea how to do it )
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  #4  
Old 11-04-2012, 11:46 AM
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It's in there if you read it.

Remove the oil pan and the timing cover, then you can easily do the job.
Removing the oil pan and the timing cover is not easy. (I would rather replace a head gasket.)
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #5  
Old 11-04-2012, 12:00 PM
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Do you have the oil pan off yet? It mentions in that link the oil pan has to come off if you are replacing the chain.
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  #6  
Old 11-04-2012, 05:44 PM
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The broken chain could be the symptom. I would want to know why it broke.
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  #7  
Old 11-04-2012, 06:32 PM
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maybe i'm blind .... as i stated earlier " how to remove the timing chain cover " NOWHERE does it say anything about removing cover .... ..... pls show me where in all that text ( other than talking about what happened and a vague reference to removing the oilpan ) does it say anything about how to remove the timing chain cover ...even if i did remove the oilpan i can't see how it's even physically to put the oilpump chain back on that way .... impossible pls enlighten me ......

it's like saying i removed belt tensioner ...... HOW did u do it ????
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  #8  
Old 11-04-2012, 06:34 PM
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simply put ...... how do i remove the timing chain cover ...i already removed ALL the bolts i could see on front of engine but no go .......
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  #9  
Old 11-04-2012, 06:49 PM
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The oil pump chain snapped while it was doing 75+mph on the freeway. The engine is now a door stop. I will get to it but do not know when. I hope your engine is not damaged when it is starved of oil.

If I read all the posts correctly, I think the oil pan needs to come off to replace the chain. You also need a chain crimper to crimp the master link.

Good luck.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

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2 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
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  #10  
Old 11-04-2012, 07:09 PM
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so would i ...

Quote:
Originally Posted by rscurtis View Post
The broken chain could be the symptom. I would want to know why it broke.

so would i .... no idea..... yet ... i wish everyone would quit telling me to take the oilpan off .... i need to know how to take the timing chain cover off.... doesnt anyone know how to do it ??? and i see no way to put the chain back on ... how the heck am i supposed to thread it on ..... ????
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  #11  
Old 11-04-2012, 07:17 PM
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You have to remove the hole oil pan, not just the sump. Which is a real pita. But the fun is only beginning!

Then you have to remove the chain tensioner. (The oil pump chain tensioner. You will see it up under there when you get the whole oil pan off.

THen you have to remove the sprocket with some screwdrivers.


Then I think it's just a couple of long bolts holding it on.

I have to say I'd rather have a root canal than have to remove the lower oil pan with the engine in the car!
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  #12  
Old 11-05-2012, 09:49 AM
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I have replaced my oil pump in my SDL without removing the chain cover. The tensioner is for the timing chin only, not the oil pump chain.

I only removed the oil pan. Everything is accessible from underneath.
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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
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  #13  
Old 11-15-2012, 12:55 PM
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What ended up happening on this one?
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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

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  #14  
Old 11-15-2012, 09:02 PM
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I hope the guy didn't kill himself. Things weren't looking too good.
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  #15  
Old 11-16-2012, 12:58 AM
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Unhappy the contiuning saga ... not pretty ... let me know what u think ???

btw ... i had to replace the front wheel bearing when i replaced the front brake rotor ... how tight is that bolt that holds it on supposed to be .. anyone know ????

Thanks for all the help and concern guys, i didnt go postal ..... yet but i'm getting there ... i agree with other guy, there are LOTS of things i would rather do than this " project " again....... between work and finding time to do this " project " ( anybody got some dynamite ... just today i finally got the oilpump out although my method may be a little unorthodox ...

hopefully this will gives others some hope when faced with this situation ... just to set the " records " straight ...

1. YES you can remove the front timing cover WITHOUT removing the head ...there are 2 bolts inside head on the front you need to remove and comes off alright ...

i figured i would remove it since most of the stuff was already removed from doing water pump and front seal .....

i didnt have to lift the motor to " drop " the oilpan enuf to get the oilpump out ... if your a contortionist you'll be able to remove the three lox bolts with a # 40 lox socket and 3/8 ratchet ....

i figured lifting the motor was a last resort ... looked to intimidating to me .....

i did end up pulling the oil pump out the front of the engine NOT thru the inspection cover ....


now if i can only remember where all the parts go back and not have anything left over when i'm done ( in this lifetime ) i should be fine LOL

Last edited by netpro; 11-16-2012 at 01:01 AM. Reason: spelling errors ... ratchet NOT wrench :)
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