I pulled the filter bolt to check to see if I need to order new O-rings and found this. I have an "01" filter housing on an 84 300SD.

This bolt has an alum. (I assume) washer AND a huge upper o-ring but the bolt is much longer and has no groove for the large o-ring like the pics of the newer style bolt does. Anyone else have this bolt?? Could this have caused some problems? I dont see how it could unless the o-ring blocked the hole but it is a very tight fit and couldnt slide downward easy. Maybe this was an ok fix, or maybe someone was insane thinking this was ok?

That looks like the correct bolt for your filter housing part #.
It uses 2 "O" Rings and the Aluminum Washer.

If you had the Filter Housing with the #02 in the part #, then
You would use One "O" Ring and no Aluminum Washer.

Iam pretty sure the 84 SD would have come with the filter housing with the 02#.
maybe someone before you changed the engine with an older one?

Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Im seeing the opposite of what you are saying in other posts after lots of searches. This is suppose to have ONE o-ring since it's an 01 housing. There's no upper groove, as you can see. Still, maybe the PO had a good idea as this hasn't leaked at all.

Mercedes source says that late '84's and 85's use the later 02 style in their 02 style bolt service kit ad.

The bolt you show does have the 2 "O" Rings, but looks too long to be used with the filter housing with the "02" in the part#.

the length looks like the one used with the "01" in the part #.

http://www.peachparts.com/shopforum/diesel-discussion/296239-main-fuel-filter-leaking-top-am-i-missing-something.html


This picture shows a shorter stubby bolt.



http://www.peachparts.com/shopforum/diesel-discussion/282537-fuel-filter-o-ring.html






Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Um, yes, I have the 01 housing like I said. The bolt I have just has an o-ring added to it. There's no groove.

Sorry I don't understand your point.

Your first post looks like the bolt has 2 "O" Rings. Is that one by your fingers?

If there is no groove, maybe the wrong bolt?

Iam not trying to be d**k, maybe I don`t under stand the question.


Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

I posted it to get another opinion to see if anyone had seen this done before. Since posting I have found some other info pointing to this being rather odd.

The bolt I have is correct for my 01 housing but the larger o-ring was added by someone in the past. I should have just the washer (copper or alum) and the one smaller o-ring.

With all the leaking issues people have had, I now wonder if this is some common technique to help stop fuel leaking or is it something known to be a bad idea, or has anyone seen this done at all?

No one has posted some one adding the extre O-ring to the Filter Bolt that is not supposed to have one.
Hoever, the bore a the top of the O1 Housing is tapered and is obviously allowing the O-ring to seal.

Does the Filter Bolt Head make it all the way to the top of the Filter Housing when it is tightened?

I have a few of the old housings that have that longer Filter Bolt and the single O-ring.
If a bit of air got into the top of the Fuel Filter the longer Bolt would keep the Air from being pushed into the Fuel going to the Fuel Injection Pump and there is a tiny hole at the top to bleed the air off. So in that case the longer Bolt is a good thing as it offers a better chance to get rid of Air in the Filter.

However, the opposite is true if Water got inside the Fuel Filter. With Water in the bottom the longer Bolt would allow the Water to be pusned into the Fuel Injection Pump sooner then it would with the shorter Filter bolts.

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84 300D, 82 Volvo 244Gl Diesel

That's a really tough call to say the o-ring is actually sealing. You can test it out with a regular washer on the bolt head to see if it leaks. If it does, than stay with a copper crush washer... Or better yet, get the 02 housing with the shorter bolt for better water protection as D-911 pointed out.


.

__________________
1983 123.133 California
- GreaseCar Veg System

My bet is the PO of that car, had a filter or engine replacement in the past, and when he goes to the store to get filter it comes with two o-rings, so he put them both in... that filter is NOT supposed to have two o-rings. only the smaller one. however the CAR should have the 02 housing that DOES use two o-rings.
I'd get the correct housing, with the correct two ring bolt, and swap it in.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Yes the bolt sets all the way down like normal.

How do you know this wasn't the stock housing? Only late 84's supposedly had the 02, from what I was told. Look at Mercedes source too.

As long as it is sealing OK I don't see a reason to change the Housing.

If you think it is possible for that long Filter Bolt suck in Water if some got in simly Hacksaw it off to shorten it.

Or you can simply use a new Crush washer but if you can get a Copper one. A Copper Crush Washer can often be reused by heating it red hot and then cooling it and that softens it.

Another alternative that oneo of our Members used is a NU-lip bonded aluminum washer that has rubber on the inner edge; claimed it came from ACE hardware.

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84 300D, 82 Volvo 244Gl Diesel

It looks like someone swapped the housing to an 01 and put an O-ring on the 01 bolt; keeping the crush washer. I have seen both styles and that bolt is not from an 02. If both of my 1983 300SDs have 02 housings, yours should, too. The reason it does not leak is because of the aluminum seal at the top of the bolt. The second O-ring does not even look to be in a groove.

__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

There is a reason our site blocks mention of that site... Adding a space to get around the block is unwise...


1983 and up 617's came with the 02 filter base... Quoting that websites as a place to go for knowledge is equally unwise...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

It is possible someone replaced the old bolt with a new style one.

If it doesn't leak at the top of the bolt, you're good. I recommend doing this, but don't know if you need the 02 head or not, let us know.

Just made this video:
https://www.youtube.com/watch?v=HLs8faKsPlU&feature=youtu.be

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83 SD

84 CD