Fully opening injectors help the power

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ADow
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Fully opening injectors help the power

Post by ADow » Sun 06 Jan, 2008 1:35 pm

#1 son has been complaining that his 300D lacks power, particularly in comparison to his sister's. After making helpful comments like 'what do you expect, it's a 300D' I got him to sit in the car with the engine off and put his foot flat on the go pedal, and then I manually pushed on the injector linkages to see if there was any further travel - yes, about 2cm. Using the adjustment nut the slack was eliminated so that the injectors are now fully opened when he puts his foot flat down. It's made a big difference to the performance - not rocket science I know, but something to check if you want to get the best out of your diesel.
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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AMG
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Re: Fully opening injectors help the power

Post by AMG » Sun 06 Jan, 2008 4:48 pm

Perfect tip for a sticky topic.
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Classic 4sp auto Ardennes Green "Oswald"
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Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
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bruceT
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Re: Fully opening injectors help the power

Post by bruceT » Sun 06 Jan, 2008 8:38 pm

As long as you don't affect the kickdown rod when you do this. On my early 76 model it's a bit of a fiddle getting it right.

Alastair, have you done a diesel purge yet?
Cheers
Bruce

http://oztayls.blogspot.com/
http://oztayls-shesha.blogspot.com/

Past Benzs:
1976 W123 300D (Running on SVO (Straight Veg Oil) since June 2006-Sold in Nov 2008)
1982 W126 280SE - Unregistered (Free to a good home!)
1993 W124 300D (running on 100% used cooking oil, no conversion and no glow plugs!)

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ADow
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Re: Fully opening injectors help the power

Post by ADow » Mon 07 Jan, 2008 2:34 am

No purge yet - but I'm watching the discussion with interest.
Alastair
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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bruceT
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Re: Fully opening injectors help the power

Post by bruceT » Mon 07 Jan, 2008 6:47 pm

There's not many diesels that won't benefit from a purge. Frees up the injectors and removes any carbon"cones" that form on them that cause them to squirt instead of spray. At around $20 per purge, it's a cheap service.
Cheers
Bruce

http://oztayls.blogspot.com/
http://oztayls-shesha.blogspot.com/

Past Benzs:
1976 W123 300D (Running on SVO (Straight Veg Oil) since June 2006-Sold in Nov 2008)
1982 W126 280SE - Unregistered (Free to a good home!)
1993 W124 300D (running on 100% used cooking oil, no conversion and no glow plugs!)

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Re: Fully opening injectors help the power

Post by Dweezil » Fri 11 Jan, 2008 3:41 pm

Did the purge recently on Hieronymous and noticed bugger-all difference. The thing that was obvious was the almost complete lack of smoke while doing the purge. Had to really hammer him to get a puff, but back to the usual "average" amount of smoke once the BD was back in.

Dweezil

Tuppy
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Re: Fully opening injectors help the power

Post by Tuppy » Wed 16 Jan, 2008 10:58 pm

Hmm i might try that one, my parents 300D is a lot faster then mine.

Then again theirs has a had a full engine rebuild and mine has done 480,000 without a rebuild so yeah that could be it too :lol:
Luke

1981 W123 300D Silver 480,000km

MB300D81
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Re: Fully opening injectors help the power

Post by MB300D81 » Tue 26 Feb, 2008 10:40 pm

Have you done valves adjustements for your diesel engine?

It is also amazing how much of a difference in performance the adjustments make.
Best Regards,

Fitian
<><

1991 300D 260,000 on WVO
1993 300D 200,000

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Gelandewagen
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Re: Fully opening injectors help the power

Post by Gelandewagen » Tue 26 Feb, 2008 10:51 pm

Check the timing chain as well.

MercedesShopWiki: Measuring Timing Chain Stretch
W123 300D
W124 300E

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ADow
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Re: Fully opening injectors help the power

Post by ADow » Tue 26 Feb, 2008 11:07 pm

I've had the injectors replaced. It's certainly quieter and seems to have more power.
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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bruceT
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Re: Fully opening injectors help the power

Post by bruceT » Wed 27 Feb, 2008 8:35 am

ADow wrote:I've had the injectors replaced. It's certainly quieter and seems to have more power.
Hi Alastair

I'm interested to know what the old injectors looked like. Was there any "coning" or carbon build-up on the nozzles that can affect the spray pattern? Were they worn?
Cheers
Bruce

http://oztayls.blogspot.com/
http://oztayls-shesha.blogspot.com/

Past Benzs:
1976 W123 300D (Running on SVO (Straight Veg Oil) since June 2006-Sold in Nov 2008)
1982 W126 280SE - Unregistered (Free to a good home!)
1993 W124 300D (running on 100% used cooking oil, no conversion and no glow plugs!)

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ADow
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Re: Fully opening injectors help the power

Post by ADow » Wed 27 Feb, 2008 9:06 am

The ends of the injectors around the little spray hole were coated with a carbon buildup. The mechanic felt it was quite possible that the injectors were the originals. It was difficult to tell whether there was any wear to the needles without making a direct comparison with the old and the new, and I didn't see the injectors before they were installed. It only cost $90 labour to have them installed so I got a mechanic to do it. He was quite amused that we would be doing this with a 420,000 km car as injector replacement on w123 diesels is something he is rarely asked to do. The impression I got was that people are just running their diesels into the ground. If this is the case it is a shame because even at 420,000 km a well maintained 300D is a very good car - but then I don't need to tell you that!
Alastair
1971 280SE 3.5 - Don Ottavio - sold
1980 300D (formerly daughter's) - Heidi - sold
1999 C200 Elegance (currently daughter's)
1981 300D (son's) - Hektor
1998 Puma Clubman with 225 RWKW SR20DET - Percy
http://www.youtube.com/user/adow77

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Screamin TE
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Re: Fully opening injectors help the power

Post by Screamin TE » Mon 04 Aug, 2008 9:36 pm

When i worked at a truck stealership, one of the things we used to do when customers complained of low power from their trucks, especially non turbo ones was a Wurth Hot Set, and a timing and valve clearance check.

Basically, you mix it with diesel to an amount that is relevant to the engine capacity, 500ml of product and 500ml of diesel per 3L of engine capacity.

Put the fuel pick up, and return line in the mix and run the engine on fast idle till the mixture runs out. Change filters, check and adjust timing, and check and adjust valve clearance.

We had truck coming in chuffing black smoke and really underpowered to leaving with completly clear emissions and going really well.

http://www.wurth.com.au/hotset.asp
On the hunt for a project merc......W116 280E.........got one your giving away????Pm Me....please..

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GrampiansMerc
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Re: Fully opening injectors help the power

Post by GrampiansMerc » Wed 24 Mar, 2010 9:29 am

hey there I rang the company that makes Wurth Hot Set but they said it was not produced anymore.
Is there another product that would do the same job?
1980 300TD "Anna" - 400,000kms and still cruising, converted to SVO
1979 300D - sold, gone to be restored
1980 300D - "Lightning" recently purchased and currently making repairs
2006 Musso - Korean Mercedes, 5 cylinder diesel - Blown head gasket, buggered motor, grrrrrrr (I will stick with German Mercs)
Looking for 300GD LWB five door!
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Gelandewagen
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Re: Fully opening injectors help the power

Post by Gelandewagen » Wed 24 Mar, 2010 11:43 am

I won't vouch for this company, this stuff could be snake-oil as far as I know, but to answer your question:

http://www.costeffective.com.au

In my opinion there are no cheap-and-easy fixes for Diesel engines.
W123 300D
W124 300E

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petermc236
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Re: Fully opening injectors help the power

Post by petermc236 » Wed 24 Mar, 2010 12:55 pm

I have used LIQUI MOLY Diesel purge with good results.
You can buy it from SuperCheap or can be bought online at http://www.liqui-moly.com.au/

Purge is also covered in this topic
viewtopic.php?f=5&t=7102

regards
-petermc


'11 S204 C200 - grauenwagen
'13 FIAT 500 - der einkaufswagen

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magenta
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Re: Fully opening injectors help the power

Post by magenta » Sun 29 Jul, 2012 6:54 pm

ADow wrote:The ends of the injectors around the little spray hole were coated with a carbon buildup. The mechanic felt it was quite possible that the injectors were the originals. It was difficult to tell whether there was any wear to the needles without making a direct comparison with the old and the new, and I didn't see the injectors before they were installed. It only cost $90 labour to have them installed so I got a mechanic to do it. He was quite amused that we would be doing this with a 420,000 km car as injector replacement on w123 diesels is something he is rarely asked to do. The impression I got was that people are just running their diesels into the ground. If this is the case it is a shame because even at 420,000 km a well maintained 300D is a very good car - but then I don't need to tell you that!
I'm interested to know who you are using as a mechanic in Adelaide? I need a good one for my 300TD
1980 Manila beige 300TD

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julian
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Re: Fully opening injectors help the power

Post by julian » Sun 26 Aug, 2012 11:26 pm

Barrie Greene. Saw the introduction of the w123 as a mechanic and has been turning spanners on Mercedes since.
Excellent mechanic, great advice and very good prices.

http://www.derek.com.au/BARRIEGREEN.HTML

Others on here will confirm this.
w123 240D auto Lang
A Discovery 3
An Outback 3L
Previously: 1977 300D, 1979 300TD, 1982 280SE, 1988 560SEL

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300TDT
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Re: Fully opening injectors help the power

Post by 300TDT » Mon 08 Jul, 2013 10:53 am

I'm about to replace the nozzles on my OM617.

Does anyone have any left-over shims that they don't need? Happy to pay.
'82 300TD Turbo : '83 model, LHD, auto, anthracite grey, cream cloth, chassis: 380,000km, engine: 195,000km.

om diesel
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Re: Fully opening injectors help the power

Post by om diesel » Sun 20 Oct, 2013 12:03 am

Hi everyone, injector nozzels on Om 636,621,615,616&617, generally do not have a lot of issues, other than water contamination. Faces (facing Pre-Chamber throat) will be eroded by combustion process. I am in ADELAIDE and can set up these nozzels. Contact, OLAF ZAWORSKI @ 83462650 or 0421515813

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