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  #1  
Old 01-14-2013, 03:52 AM
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Location: Idaho
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main seal parts list?

I'm trying to get a good idea of what i should replace while i have the engine apart for my rear main seal. i'm getting new motor mounts/shocks and replacing gaskets related to turbo. i was wondering if it would be a good idea to replace the bearings while the crank was exposed or if it would lead to big problems. i'm looking to keep this under $500 in parts and am at $130 after mounts/shocks and the gaskets i talked about above.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800

Last edited by benzdude42; 01-14-2013 at 04:07 AM.
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  #2  
Old 01-14-2013, 04:05 AM
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When you reassemble the engine you should ideally check the clearance of the bearings with plasti-gauge (or en equivalent).

However,

Is the crankshaft scored?

Are there and wear / damage marks on the existing bearings?

Have you mixed them up?

Did you measure the end float of the crank before you took it to pieces?
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  #3  
Old 01-14-2013, 04:17 AM
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i havent started and wont tell it warms up. i'm trying to extend my engine for as long as i can. i'll be in the middle of farming when i start the project, so i was hoping to be able to have the parts ready to go. i do have another crank that i could have a shop check and by bearings for. would it be to much work to just replace the crack compared to a rebuild? my engine has quite a knock that comes and goes based off the weather, rpms, how long its been sitting, and if i have done any injector work on it. no one can tell me whats up with it. over 10k miles on it from the day i bought it with a injector knock that got worse, then better, then worse, then gone for 250 miles and then came and went based on random things. its gone and at anything above 2500 rpms and worse at 1500 rpms. i saw a video on youtube with the same noise, but the dudes cam went out on it one day.
__________________
84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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  #4  
Old 01-14-2013, 04:25 AM
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Join Date: Feb 2012
Location: Idaho
Posts: 384
sounded like this when i first bought it.
Ticking sound on a 1982 Mercedes-Benz 300 D Turbo - YouTube

this is what it sounds like now but a little louder at times. not my vidoes btw and i left the car back at my parents house so i cant record the noise.
85 300D Mercedes engine knock - YouTube
__________________
84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
Reply With Quote
  #5  
Old 01-15-2013, 03:22 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Benzdude42 - I'm confused - is your engine in pieces or not?

If you haven't taken it to bits yet you should ideally start by reading through the FSM to get an idea of what is involved.
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #6  
Old 01-15-2013, 08:42 AM
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Join Date: May 2008
Location: Baltimore, MD
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Don't pull the motor apart unless the rear main IS ACTUALLY LEAKING.

If you're pulling it for preventative maintenance you money is better spent on a timing chain and injectors.

Your knock is probably an injector that needs servicing. You can send them out to be cleaned & balanced it's under $100. Greazzer and some otheres do the injector service
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  #7  
Old 01-18-2013, 02:04 AM
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Join Date: Feb 2012
Location: Idaho
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its the main seal. the car sat for over 5 years with out being driven and only started leaking after being driven for little over 300 miles. the leak gets bigger over time and only comes from the back of the engine, not from the value cover.

__________________
84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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