Block Drain Fitting - PeachParts Mercedes-Benz Forum

300SD81 · #1 11-04-2007, 03:27 PM

Since I'm replacing my water pump soon and have to drain the coolant anyway, I figured it'd be a good time to install the block heater I've had sitting around forever.. Its a ZeroStart tank style. What size is the thread on the block drain? The ZeroStart Mercedes adapter is insanely priced (more than I paid for the heater (which includes a 1/4NPT adapter)) There must be somewhere I can get an adapter that converts whatever the drain plug is to 1/4NPT...

junqueyardjim · #2 11-04-2007, 05:17 PM

It shows it and gives a part number, but nothing more then that. What I would do is pull, "that is carefully remove" the plug and take it to NAPA to see if they can match the threads. They have a big line of those old Weatherhead fittings and I just think they will fix you up.

#3 11-04-2007, 06:41 PM

It's likely going to be metric threads, I'd bet M10x1.0mm IIRC. That can be hard to find and NPT fittings will not work.

Look through the phonebook for a metric shop. There is a place here in Denver called AAA Metric that stocks nearly every metric bolt, nut, fitting, tube and anything else you can imagine. If they can't find it, they will make it. Great place, they saved my @ss a few times.

Find a place like that and you'll be all set.

omegabenz · #4 11-05-2007, 03:59 AM

Hello,

recommendation on OIL HEATER for 617 Turbo

Eventhough I have the tank model that you posted, I decided to order the one from JCwhitney (free shipping over $75) and the new fitting because i wanted it all there for me. The new one has a circulation pump, where the tank model you posted does not.

I have two of those fittings you want right here. They are $22 new right (plus $16 shipping from JC whitney), that is how much I paid. I have found it's easier to just bite the bullet and buy it because you will waste 3 hours at napa and joes auto without any luck. I think that they are expensive is because they are made on a LATHE.

Ill send you one for $20 shipped in the US if you want.

I measured these ones here, they are m14x1.5. When I had the 87 300D block drain out a week ago, i measured it at 14mm, but I did not measure the pitch. So if we can assume that Zerostart is right with their mercedes adapter, then 14mm x 1.5.

I hope this helps, and check out my other thread (above)

heelerguy · #5 11-05-2007, 07:22 AM

If it were my choice I'd take the tank heater back and get a freeze plug heater for that make and model. Costs about $50 and comes with a metric adapter that fits it right into the block. In my opinion a freeze plug heater is far more efficient than a tank heater and much easier to fit to the engine. The adapter for that type of heater should be on the passenger side of the block just beneath and toward the back of exhaust manifold. I just installed the heater for a 300 into my 190 2.2 and it was about $50 at napa. To fit it to the 190 took a bit extra due to the shallow water jacket but was still pretty easy to fit.

Regards,

Jim

C Sean Watts · #6 11-05-2007, 12:46 PM

Quote:

Originally Posted by heelerguy

If it were my choice I'd take the tank heater back and get a freeze plug heater for that make and model. Costs about $50 and comes with a metric adapter that fits it right into the block. In my opinion a freeze plug heater is far more efficient than a tank heater and much easier to fit to the engine. The adapter for that type of heater should be on the passenger side of the block just beneath and toward the back of exhaust manifold. I just installed the heater for a 300 into my 190 2.2 and it was about $50 at napa. To fit it to the 190 took a bit extra due to the shallow water jacket but was still pretty easy to fit.

Regards,

Jim

When I was in Europe I saw only a few of these even on old diesels. They are mainly made for far northern Europe and Scandinavia. Unless you spend winters in central/northern Canada it would be overkill. The plug type is fine, even for PA, NY, etc.

omegabenz · #7 11-05-2007, 01:23 PM

Quote:

Originally Posted by heelerguy

If it were my choice I'd take the tank heater back and get a freeze plug heater for that make and model. Costs about $50 and comes with a metric adapter that fits it right into the block. In my opinion a freeze plug heater is far more efficient than a tank heater and much easier to fit to the engine. The adapter for that type of heater should be on the passenger side of the block just beneath and toward the back of exhaust manifold. I just installed the heater for a 300 into my 190 2.2 and it was about $50 at napa. To fit it to the 190 took a bit extra due to the shallow water jacket but was still pretty easy to fit.

Regards,

Jim

THE CROIX: Getting out the freeze plug. I cant get mine out, and I tried almost everything without damaging the block. So I opted for a tank heater.

kerry · #8 11-05-2007, 04:11 PM

I got a 600Watt Zerostart lower radiator hose heater on Ebay for $15. Installing it is a lot easier than trying to get a plug out of the block.

omegabenz · #9 11-05-2007, 04:15 PM

Quote:

Originally Posted by kerry

I got a 600Watt Zerostart lower radiator hose heater on Ebay for $15. Installing it is a lot easier than trying to get a plug out of the block.

Which plug?
The freeze plug, yeah thats a PITA.

The block drain is easy.

I just had trouble with the lower radiator hose ones. I tried 3 each didnt work., so I am trying out the tank style one.

300SD81 · #10 11-05-2007, 06:53 PM

I found the fitting locally for about $5

If anyone else needs some, I can probably ship them to you for $10 total.

omegabenz · #11 11-05-2007, 11:41 PM

Quote:

Originally Posted by 300SD81

I found the fitting locally for about $5

If anyone else needs some, I can probably ship them to you for $10 total.

Post a pic, did you get it at napa?

omegabenz · #12 11-05-2007, 11:46 PM

Quote:

Originally Posted by omegabenz

Hello,

recommendation on OIL HEATER for 617 TurboI measured these ones here, they are m14x1.5. When I had the 87 300D block drain out a week ago, i measured it at 14mm, but I did not measure the pitch. So if we can assume that Zerostart is right with their mercedes adapter, then 14mm x 1.5.

I hope this helps, and check out my other thread (above)

I have verified m14x1.5.

mobetta · #13 11-06-2007, 10:28 AM

well, I could not find exactly where on JCW's web that it says there is a pump on these units. most of these tank type heaters I have seen use convection to circulate the coolant....

I presently have a 1 1/2" 600 watt lower hose heater, and a 1000watt tank type heater, NIB. I have not installed either one, because I cannot decide on which one to use. I would like to use the tank type, but would need an adapter for the block drian....

if the JCW unit DOES have a pump, i would return both my Katz units and order it, along with an adapter. this would be the most $$$.

otherwise, I would be interested in 300SD81's proposal to ship one out. I will try a few local import specialists first.

omegabenz · #14 11-06-2007, 12:37 PM

Maybe I misinterpreted.

Built-in thermostat prevents overheating and burnout. Keeps engine warm by circulating warm engine coolant through entire engine. Quicker heater and defroster output. Connects to 5/8" heater hose—operates on regular AC house current. 120 volt. With 1-ft. grounded cord and instructions.
750-Watt. Warms 4-cylinder engines in 2-3 hours, 6-cylinder engines overnight.
1,000-Watt. Warms 6-cylinder engines in 2-3 hours, 8-cylinder engines overnight.
1,500-Watt. Warms 8-cylinder engines in 2-3 hours.
Imported Car Adapters. Choose adapter for all Mercedes (sold separately, ZX541142).

mobetta · #15 11-06-2007, 03:27 PM

looking at a few other places that sell the zerostarts, they are of thermosiphon design- no pump needed. that is why they must be at the lowest point in the system, and gravity fed.

FWIW- ebay seller has them for $40, shipped?!(1500w)

I did call metric auto parts in town, they dont have the proper fitting. And I just placed an order w/ JCW ON SUNDAY