im about reddy to buy a 83 240D with a stick and i would very much like to put a tach in there im wandering how that may be achieved. it has a leaky oil pressure gauge that need to be replaced so i wouldent be instaling a cluster just for a tach. but i also wanted to find out about an inductive pick-up tack and how thouse work as far as cost and instalation. thanks for you help.

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Seth,

2 parts egg, 4 parts flour, 1 part salt and 6 parts 55 Cetane diesel fuel

1965 corvair monza convertable
1984 euro 300D 4 speed (NO LEATHER, ALL MANUAL)100,000 miles
Thank god the ford is gone

Lets include 1980 240d's in this question... since I am interested also....

search this here forum on "oil, leak, gauge" You'll find out all about leaking oil pressure gauges.

ed by R Leo

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Never a dull moment at Berry Hill Farm.

Actrually, R Leo, I've never found a thread involving installing a tach in a 240D. I'll stand as third in line wanting to know how an OEM unit can be installed in place of the clock. Being a manual tranny, I like to be able to see where the engine is running,.

"I'll stand as third in line"

Put me down as 4th in line. Actually when I got my 5 spd someone mentioned that I should install the clock/tach but they weren't sure about the pick up. Seems it was mentioned that "it may or may not be there" Where? I will be following this thread

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Me too. I was on the sf bay bridge this morning pushing about 95 mph ( seems like there is still more room to go on my 83 240d ) . I am just wondering what is the red line on 4th. The speedometer shows 1st dot at 24, 2nd dots at 39 and 3rd dots at 64, but what's 4th. Thanks...

Ever had the speedo check on that 240D? My 240D is really buzzing at 75 mph, can't imagine it doing 95 mph unless pushed over cliff. Seems like we had the discussion before. :p MB says redline is 85.7 mph approx. for automatic and 88.8 mph approx for 4spd manual trans.

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.

Old navy: I think those dudes that go 100mph in thier 240s are ***seriously*** exceeding the redline

...and providing a testament to the solidity of the OM616 =) =)


Tach seekers- Thats the thing- the sensor on my 240 (looks exactly like the one on the 300 I owned for 3 months, not sure about the connector) and is mounted properly, same place and everything, but sends an RPM signal to the EGR computer (at certain rpms and engine temperatures the 240D's of this vintage (1982 and 83) have a computer that tells the egr valve when to open..., the black box is in the passenger side footwell IIRC.
The 300D tach signal goes from the pulley, through the sensor, to a wire to the tach amp (the cigarette fix thing), then from the tach amp to the tachometer.

If the sensors are the same part number (which I cant find out, not sure how to save going and looking for a p/n on both, and they are tough to see/get at in the first place on an OM617) then the amp and tachometer should bolt/power right up. Thats why I'm asking if someone can look up those part numbers for me.

This could be another 240D easter egg (appl to '82 and '83 models only =)

-John

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2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)

Us boy's and our toy's.

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.

I was going to buy or build one of these but found 300SD instead. Some of the guys over at one of the Powerstroke web sites spoke highly of them. The only downside is that the display only updates once per second. But, it is easy and cheep.

www.tinytach.com

Also, I was looking into this option.

http://www.4crawler.com/Diesel/CheapTricks/Tachometer/index.shtml#Kits

This one is on a VW and is optical but one could be built (for you engineers and techs out there) one using a hall effect pickup mounted somewhere. Most tachs just measure the RMS voltage. The faster the pulses occur the closer the needle moves to full scale. With the correct design and calibration any of the older tachs should work. But I am not an expert, this is just some of the diggin' I've done.

The dots are even better than the tachometer because they show when you can downshift too -- important in a 240D!

As for rpm in fourth, divide the mph by 2 and you have a very good estimate of rpm; e.g. 80 mph is 4,000 rpm. The goverened maximum engine speed of about 5,000 rpm then works out to a bit more than 100 mph indicated.

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1983 240D automatic, Orient Red, 174K
1983 240D manual, Biscayne Blue, sold at 341K

Was anyone actually able to get a tach amplifier and gauge from a 300D and plug it in to an existing rpm sensor in their 240D? It seems there were several discussions, but no specific success stories.

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J. S. Park

'82 240D Manual 240D (sold)
'83 300D-T 230k (sold)
'84 300D-T 118k (sold)

and posted a thread about needing a voltage measured- I didnt put it in this thread b/c I need help from someone w/ a 300D - (whom this thread isnt really aimed at...)

I got the tach amp from the junkyard today (not sure if it works...) and I could just solder everything together, but I'd like to have an idea that things are **close** to working before I do it. If the 240D signal needs amplified, I might be able to make/cajole EE friends enough to make an amp for myself and post it up here.

Edit- the 240D egr sensor and the 300D tach sensor are **not** the same connector.

-John

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2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)

Perhaps it is my being used to driving large diesels (I am a bus driver for the U of Toledo.. the best student job there is).. but wouldn't it just get to a point where it will not rev any more.. and still be safe? I know on the 8.2 Detroits and most of our 6V92s that they will sing along maxed out on their speed limiter, which is coincidentially also their rev limiter.
~D.J.~

Yup, MB diesels have rev limiters in them as well. The idea for the tach is to be able to see how hard the engine is working, and to be able to have a visual aid to keep that little engine in it's powerband. Personally, I still like tachs even in automatic tranny equipped cars. They can give you an early indication of tranny trouble that may not be immediately noticeable to the ear.

I once had an 86 Hyundai Excel. It had the ugly large analog clock in the cluster. I swapped it out for a tach (easy to do thanx to modular design), and it worked immediately. I wanted more guages, so I installed a digital set for oil pressure and battery voltage. It had a temp guage, so I modified one of the lines between the tranny and cooler and used the temp guage to monitor tranny temp. I like having a maximum number of guages in a car. It doesn't matter to me if the guage is necessary or not. More guages mean more info on the car's well being. Since I used to drive trucks, I got used to lots of info on the health of the truck, and inevitably look to get more than the designers thought of during the vehicles design. Being an MB, I won't put funky add-on's like those in, but a factory tach is icing on the cake for a manual tranny.