STD Maintenance General Fuel consumption

Fuel consumption

Fuel consumption

 
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Imaginos
In disguise

66
05-10-2011, 06:14 PM #1
I have a problem with the fuel consumption, it's quite excessive, in range of 15-17l/100km (roughly 14-15.5 mpg) in the city, with normal driving (I almost never floor it), and because of the time of day I drive I never get stuck in traffic.

The car is 1981 300TD Turbo. It has roughly 100k miles (no joke), and at some point it was converted to a 4 spd manual (not by me). I doesn't smoke (even under full load), and sounds ok (I will post profile of my car later this week, likely with both video and photos). It's a Euro model, so no EGR either.

Any suggestions?
This post was last modified: 05-10-2011, 06:15 PM by Imaginos.
Imaginos
05-10-2011, 06:14 PM #1

I have a problem with the fuel consumption, it's quite excessive, in range of 15-17l/100km (roughly 14-15.5 mpg) in the city, with normal driving (I almost never floor it), and because of the time of day I drive I never get stuck in traffic.

The car is 1981 300TD Turbo. It has roughly 100k miles (no joke), and at some point it was converted to a 4 spd manual (not by me). I doesn't smoke (even under full load), and sounds ok (I will post profile of my car later this week, likely with both video and photos). It's a Euro model, so no EGR either.

Any suggestions?

totaldisaster
lightly modded OM606

211
05-10-2011, 10:48 PM #2
Are you familiar with the standard maintenance items?

Please list which ones you have recently taken care of.
This post was last modified: 05-10-2011, 11:44 PM by totaldisaster.
totaldisaster
05-10-2011, 10:48 PM #2

Are you familiar with the standard maintenance items?

Please list which ones you have recently taken care of.

Imaginos
In disguise

66
05-11-2011, 03:33 AM #3
(05-10-2011, 10:48 PM)totaldisaster Are you familiar with the standard maintenance items?

Some of them, yes.

(05-10-2011, 10:48 PM)totaldisaster Please list which ones you have recently taken care of.

I haven't done anything on it. Got the car few months ago, checked the fluids and that's about it, but I haven't driven it 'cause I was taking care of some things, just started driving it 2 weeks ago.
Imaginos
05-11-2011, 03:33 AM #3

(05-10-2011, 10:48 PM)totaldisaster Are you familiar with the standard maintenance items?

Some of them, yes.

(05-10-2011, 10:48 PM)totaldisaster Please list which ones you have recently taken care of.

I haven't done anything on it. Got the car few months ago, checked the fluids and that's about it, but I haven't driven it 'cause I was taking care of some things, just started driving it 2 weeks ago.

totaldisaster
lightly modded OM606

211
05-11-2011, 10:12 AM #4
Adjusting the valve lash is your top priority then.

followed by filters, injection timing, inspecting the chain wear, rebuilding the injectors and brakes.

I might have missed some. But if they don't make a difference, you could just be looking at a tired engine.
totaldisaster
05-11-2011, 10:12 AM #4

Adjusting the valve lash is your top priority then.

followed by filters, injection timing, inspecting the chain wear, rebuilding the injectors and brakes.

I might have missed some. But if they don't make a difference, you could just be looking at a tired engine.

Imaginos
In disguise

66
05-11-2011, 10:26 AM #5
Thanks. Hopefully it's not a tired engine. That would blow big time. Sad
Imaginos
05-11-2011, 10:26 AM #5

Thanks. Hopefully it's not a tired engine. That would blow big time. Sad

Imaginos
In disguise

66
05-12-2011, 02:01 PM #6
So the list would go something like this?

  1. Open the hood (yes used to work just fine but even that went wrong, when I pull the lever now the hodd doesn't even pop out <FACEPALM>)
  2. Adjust the valves
  3. Change filters
  4. Diesel purge?
  5. New injector nozzles (Monark)?
  6. Injection timing (can I do that myself or do I need high-pressure pump specialist?)
  7. Inspect the chain wear
  8. Brakes

I'm mechanically adept, just new to OM617, and rather than second guess I ask people that have experience with these cars.

Also, am I looking at possible need to rebuild IP?
This post was last modified: 05-12-2011, 02:05 PM by Imaginos.
Imaginos
05-12-2011, 02:01 PM #6

So the list would go something like this?

  1. Open the hood (yes used to work just fine but even that went wrong, when I pull the lever now the hodd doesn't even pop out <FACEPALM>)
  2. Adjust the valves
  3. Change filters
  4. Diesel purge?
  5. New injector nozzles (Monark)?
  6. Injection timing (can I do that myself or do I need high-pressure pump specialist?)
  7. Inspect the chain wear
  8. Brakes

I'm mechanically adept, just new to OM617, and rather than second guess I ask people that have experience with these cars.

Also, am I looking at possible need to rebuild IP?

Volker407
naturally aspirated

157
05-12-2011, 03:07 PM #7
you could also check the fuel lines for leaks (air/diesel) , pre supply pump and clutch setting

Gruß Volker
Volker407
05-12-2011, 03:07 PM #7

you could also check the fuel lines for leaks (air/diesel) , pre supply pump and clutch setting

Gruß Volker

Imaginos
In disguise

66
05-12-2011, 03:13 PM #8
Danke schön!
Imaginos
05-12-2011, 03:13 PM #8

Danke schön!

totaldisaster
lightly modded OM606

211
05-13-2011, 10:51 AM #9

Assuming you can get the hood open, filters and valves should be top priority along with fuel leaks (good call).

forget diesel purge

Many of us have used Monark and have had no negative reports.

Inspect chain wear before timing the pump. (injection timing)

Injection timing you can do yourself. Look up 'spill timing' for mechanically injected diesels to get an idea. I am sure someone here will help you through as long as you understand the basics. You will need a specific washer to replace.



(05-12-2011, 02:01 PM)Imaginos So the list would go something like this?

  1. Open the hood (yes used to work just fine but even that went wrong, when I pull the lever now the hodd doesn't even pop out <FACEPALM>)
  2. Adjust the valves
  3. Change filters
  4. Diesel purge?
  5. New injector nozzles (Monark)?
  6. Injection timing (can I do that myself or do I need high-pressure pump specialist?)
  7. Inspect the chain wear
  8. Brakes

I'm mechanically adept, just new to OM617, and rather than second guess I ask people that have experience with these cars.

Also, am I looking at possible need to rebuild IP?

totaldisaster
05-13-2011, 10:51 AM #9


Assuming you can get the hood open, filters and valves should be top priority along with fuel leaks (good call).

forget diesel purge

Many of us have used Monark and have had no negative reports.

Inspect chain wear before timing the pump. (injection timing)

Injection timing you can do yourself. Look up 'spill timing' for mechanically injected diesels to get an idea. I am sure someone here will help you through as long as you understand the basics. You will need a specific washer to replace.



(05-12-2011, 02:01 PM)Imaginos So the list would go something like this?

  1. Open the hood (yes used to work just fine but even that went wrong, when I pull the lever now the hodd doesn't even pop out <FACEPALM>)
  2. Adjust the valves
  3. Change filters
  4. Diesel purge?
  5. New injector nozzles (Monark)?
  6. Injection timing (can I do that myself or do I need high-pressure pump specialist?)
  7. Inspect the chain wear
  8. Brakes

I'm mechanically adept, just new to OM617, and rather than second guess I ask people that have experience with these cars.

Also, am I looking at possible need to rebuild IP?

Imaginos
In disguise

66
05-13-2011, 02:12 PM #10
Thanks man, I really appreciate the replies. I will tackle things this or next weekend, some of the things will have to wait after my finals.
Imaginos
05-13-2011, 02:12 PM #10

Thanks man, I really appreciate the replies. I will tackle things this or next weekend, some of the things will have to wait after my finals.

Riverstick
GT2256V

114
05-14-2011, 02:34 PM #11
And don't forget to fix the hole in the bottom of your fuel tank!

" It is far easier to get forgiveness rather than permission"
Riverstick
05-14-2011, 02:34 PM #11

And don't forget to fix the hole in the bottom of your fuel tank!


" It is far easier to get forgiveness rather than permission"

Imaginos
In disguise

66
05-14-2011, 04:36 PM #12
Big Grin I checked that already, it's fine.
Imaginos
05-14-2011, 04:36 PM #12

Big Grin I checked that already, it's fine.

jonbobshinigin
Holset

292
05-15-2011, 09:55 PM #13
Don't get to crazy and start tearing into things that may not need tampering. Save any injector pump work/adjusting for LAST. Also...posting your 0-60 time may be of benefit for us...also you should hook up a vacuum gauge and see if you are actually getting boost.

1987 300TDT - 260,000 Miles
>>275HP OM603 Project Profile here<<

jonbobshinigin
05-15-2011, 09:55 PM #13

Don't get to crazy and start tearing into things that may not need tampering. Save any injector pump work/adjusting for LAST. Also...posting your 0-60 time may be of benefit for us...also you should hook up a vacuum gauge and see if you are actually getting boost.


1987 300TDT - 260,000 Miles
>>275HP OM603 Project Profile here<<

Imaginos
In disguise

66
05-16-2011, 08:11 AM #14
I was thinking of getting a boost gauge. Will the cheap ones do the trick?

I'll see if I can test 0-60 somewhere, but it feels decently quick, just a bit slower than the 230E I used to drive (now a parts car).
This post was last modified: 05-16-2011, 09:09 AM by Imaginos.
Imaginos
05-16-2011, 08:11 AM #14

I was thinking of getting a boost gauge. Will the cheap ones do the trick?

I'll see if I can test 0-60 somewhere, but it feels decently quick, just a bit slower than the 230E I used to drive (now a parts car).

plurkje
turbodiesel

33
05-16-2011, 02:31 PM #15
(05-10-2011, 06:14 PM)Imaginos I have a problem with the fuel consumption, it's quite excessive, in range of 15-17l/100km (roughly 14-15.5 mpg) in the city, with normal driving (I almost never floor it), and because of the time of day I drive I never get stuck in traffic.

The car is 1981 300TD Turbo. It has roughly 100k miles (no joke), and at some point it was converted to a 4 spd manual (not by me). I doesn't smoke (even under full load), and sounds ok (I will post profile of my car later this week, likely with both video and photos). It's a Euro model, so no EGR either.

Any suggestions?

Maybe it's a stupid reply; but what if the brake remains hanging on?
Your fuel consumption is steep. I only get those when driving full throttle all the time (170KM/H)
What rpm does it make at 120km/h? (Should be 3000 roughly)
No clutch issues, right?
plurkje
05-16-2011, 02:31 PM #15

(05-10-2011, 06:14 PM)Imaginos I have a problem with the fuel consumption, it's quite excessive, in range of 15-17l/100km (roughly 14-15.5 mpg) in the city, with normal driving (I almost never floor it), and because of the time of day I drive I never get stuck in traffic.

The car is 1981 300TD Turbo. It has roughly 100k miles (no joke), and at some point it was converted to a 4 spd manual (not by me). I doesn't smoke (even under full load), and sounds ok (I will post profile of my car later this week, likely with both video and photos). It's a Euro model, so no EGR either.

Any suggestions?

Maybe it's a stupid reply; but what if the brake remains hanging on?
Your fuel consumption is steep. I only get those when driving full throttle all the time (170KM/H)
What rpm does it make at 120km/h? (Should be 3000 roughly)
No clutch issues, right?

Imaginos
In disguise

66
05-16-2011, 05:14 PM #16
That brakes are hanging on did cross my mind. I will check that for sure.

Clutch is working fine, I think at least, engages and disengages fine. I will check the clutch too, as Volker already recommended.

Don't have the rev counter. Angry
Imaginos
05-16-2011, 05:14 PM #16

That brakes are hanging on did cross my mind. I will check that for sure.

Clutch is working fine, I think at least, engages and disengages fine. I will check the clutch too, as Volker already recommended.

Don't have the rev counter. Angry

Imaginos
In disguise

66
05-17-2011, 11:06 AM #17
Clutch seems to be fine. Engine stalls when trying to accelerate from standstill in 3rd and 4th gear with parking brake on.

I will inspect the clutch visibly though, in 2 or 3 weeks.
Imaginos
05-17-2011, 11:06 AM #17

Clutch seems to be fine. Engine stalls when trying to accelerate from standstill in 3rd and 4th gear with parking brake on.

I will inspect the clutch visibly though, in 2 or 3 weeks.

Imaginos
In disguise

66
06-12-2011, 11:38 AM #18
Well, I was checking around the engine, what I found out is that fuel is leaking at the lift pump or primer pump, wasn't able to really pinpoint it. Basically I wiped off everything I could, started the car (it was cold) and noticed it's leaking 1 drop per second (dripping off of that hex plate on the side beneath primer pump), maybe a tad quicker. But, it stopped leaking once engine got warm. Huh

Any thoughts/ideas?

Think I will replace the primer pump.

This post was last modified: 06-12-2011, 01:57 PM by Imaginos.
Imaginos
06-12-2011, 11:38 AM #18

Well, I was checking around the engine, what I found out is that fuel is leaking at the lift pump or primer pump, wasn't able to really pinpoint it. Basically I wiped off everything I could, started the car (it was cold) and noticed it's leaking 1 drop per second (dripping off of that hex plate on the side beneath primer pump), maybe a tad quicker. But, it stopped leaking once engine got warm. Huh

Any thoughts/ideas?

Think I will replace the primer pump.

totaldisaster
lightly modded OM606

211
06-12-2011, 11:02 PM #19
Try tightening the primer pump first. If you have the older style with a white, flat handle... then it should be replaced on principle and is a likely leak source.
This post was last modified: 06-12-2011, 11:03 PM by totaldisaster.
totaldisaster
06-12-2011, 11:02 PM #19

Try tightening the primer pump first. If you have the older style with a white, flat handle... then it should be replaced on principle and is a likely leak source.

Imaginos
In disguise

66
06-13-2011, 06:57 AM #20
Yeah, that's what I was thinking too since it's older design.
Imaginos
06-13-2011, 06:57 AM #20

Yeah, that's what I was thinking too since it's older design.

Hercules
GT2559V

219
06-13-2011, 06:26 PM #21
Be sure to check known mileages ,gears in speedo.crack and slip,mileage will not be correct.
Hercules
06-13-2011, 06:26 PM #21

Be sure to check known mileages ,gears in speedo.crack and slip,mileage will not be correct.

Imaginos
In disguise

66
06-14-2011, 09:20 AM #22
Thanks. Thought about that too, but did not check it yet. Will check it.
This post was last modified: 06-14-2011, 09:20 AM by Imaginos.
Imaginos
06-14-2011, 09:20 AM #22

Thanks. Thought about that too, but did not check it yet. Will check it.

winmutt
bitbanger

3,468
06-14-2011, 04:07 PM #23
Almost certainly a primer, easy $20 fix and very nice.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
winmutt
06-14-2011, 04:07 PM #23

Almost certainly a primer, easy $20 fix and very nice.


1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42

Imaginos
In disguise

66
06-15-2011, 02:42 AM #24
I hope so. Smile

Been trying to find primer pump for two days now, no luck, have couple more places to check though.
Imaginos
06-15-2011, 02:42 AM #24

I hope so. Smile

Been trying to find primer pump for two days now, no luck, have couple more places to check though.

 
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