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  #16  
Old 01-10-2015, 09:53 AM
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Originally Posted by toomany MBZ View Post
I learn something new nearly every day.

Fortunately, the five black button ones I replaced have not leaked, using the appropriate seal ring.
I'm sure that most pump bodies can accept the new primer pump with no issue but Bosch seems to acknowledge that it might not so they give you a precaution. No reason not to properly use a little high-quality sealant.

Glad that yours are working out well.

Dan

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  #17  
Old 01-10-2015, 10:40 AM
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Just because Rectalseal is used in spacecrafts does not automatically warrant it's use in an injection pump system.

I don't recall anywhere in the FSM where a threaded fuel fitting sealed by a copper or aluminum washer calls for pipe dope sealant. I don't understand why Bosch would make an exception in the lift pump. Can you post a copy of the instructions?

No matter how careful you are in applying the pipe dope, the concern is during subsequent R&R where the dope will be disturbed and fall in. The lift pump is not in a very accessible location for cleaning. How do you plan to clean it out? Take the lift pump off? That is more work than I'd want to do.
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  #18  
Old 01-10-2015, 11:07 AM
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Originally Posted by Dan Stokes View Post
Uh. nooooo. Rectorseal is used on everything from boilers to space craft. Any applied sealant must be used SPARINGLY and can help with new parts going on old parts that may no longer be flat and perfect. I'm sure Mr. Bosch made the new primer pump to the highest standards and he also made the pump to the highest standards - 30 years and somewhat more than 200K miles ago. But this is today and it's probable that all is not what it used to be. In fact, Bosch TELLS you to use sealant in the instructions packed in the box with the new pump and I'll bet they just might know what they're talking about. I was just mentioning which particular sealant I was going to use.

Dan
The mating surfaces of the crush washer on the lift pump is just as good today as it was 30 years ago, provided it is not damaged by improper installation.
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  #19  
Old 01-10-2015, 07:46 PM
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Originally Posted by Dan Stokes View Post
I'm sure that most pump bodies can accept the new primer pump with no issue but Bosch seems to acknowledge that it might not so they give you a precaution. No reason not to properly use a little high-quality sealant.

Dan
For those who haven't read whole thread, it was mentioned in post #7 by Rebe that instructions that came with pump recommended use of Loctite 638. I Googled that and provided a link. So yes, Bosch does suggest using sealant.

In my case, original pump leaked, so did second brand new Bosch pump. When new slightly off-size crush washer was installed using same pump still leaked. Installed second new pump, but this time using sealant on crush washer surfaces as well as top few threads. I said silicone earlier, but I actually used this Permatex product.

It's all very well to write all these motherhood statements about sealants. Most of us know that stuff and have heard it over an over. But in the end, you do what you have to do with these old cars. I have been without a fuel leak for what must be a couple of years now - because I used sealant!
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  #20  
Old 01-11-2015, 10:03 AM
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I purchased a new bosch primer pump. I haven't installed it yet waiting until I get parts for transmission and put together first. I was reading on it and it says to clean and degrease M22x1. Screw togehter hand pump threaded bush and gasket by hand. Coat thread M22x1 of threaded bush with Loctite 638. Screw wnit comprising items into pump housing and tighten to M 37 +or-3 Nm. If you don't need the bushing, I was wondering if you still need to use the 638 Locktite on the threads below the gasket on the primer pump? Also, not for sure what 638 Loctite is?
What is this "threaded bush and gasket"? Do you have a pic? Is this for your 83 240D? I replaced the primer pump in my 83 240D years ago and as I recall all that was needed was the primer pump and a new (supplied) copper crush washer.
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  #21  
Old 01-11-2015, 10:53 AM
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Originally Posted by funola View Post
What is this "threaded bush and gasket"? Do you have a pic? Is this for your 83 240D? I replaced the primer pump in my 83 240D years ago and as I recall all that was needed was the primer pump and a new (supplied) copper crush washer.
They come with a reducing adapter so that they can fit two sizes of female thread.
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  #22  
Old 01-11-2015, 12:25 PM
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They come with a reducing adapter so that they can fit two sizes of female thread.
What year and model lift pumps need a reducing bushing in order to fit the updated primer pump? I'd think the sealant is recommended by Bosch only between the bushing and the primer pump since it is not a self sealing pipe thread. Once the sealnt is applied, it is permanent and the bushing would never have to be undone again so FOD is not an issue there. The seal between the primer pump/bushing to the lift pump would then be just the copper washer, no sealant.

You said the dealer gave you a copper washer that is too large which you were able to seal with the addition of sealant. Maybe if you had the correct washer, it would have sealed by itself without the need of sealant? I think sealant of any type is a bad idea anywhere in a diesel fuel injection system. I do not recall anywhere in the diesel fuel injection section of the FSM calling for it. But if nothing else works.........drastic measure is a last resort.
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  #23  
Old 01-11-2015, 01:11 PM
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Originally Posted by funola View Post
What year and model lift pumps need a reducing bushing in order to fit the updated primer pump?
Those priming pumps are used on all sorts of diesel engines. Even trucks. Some of them must require a different thread size.

Quote:
Originally Posted by funola View Post
You said the dealer gave you a copper washer that is too large which you were able to seal with the addition of sealant. Maybe if you had the correct washer, it would have sealed by itself without the need of sealant? I think sealant of any type is a bad idea anywhere in a diesel fuel injection system. I do not recall anywhere in the diesel fuel injection section of the FSM calling for it. But if nothing else works.........drastic measure is a last resort.
I think you misread my post:
-Brand new Bosch pump with new crush washer leaked.
-Same pump with slightly oversize new crush washer also leaked.
-Same pump and oversize washer with sealant still leaked.
-Second new Bosch pump and new washer with sealant does not leak.

Sometimes you just have to do what you have to do after the motherhood methods fail

The best primer pump it seems is the Monarch pump. Probably wouldn't overcome the leak problem, but sure looks like a nice unit. My dealer also had a pump - identical to current Bosch pump but a little more pricey!

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  #24  
Old 01-11-2015, 01:29 PM
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Mine leaks with it unscrewed. I go with the method of not touching it. I'm a redneck and just crack the injector lines and crank the hell out of it.

I'm gonna order that monark one eventually though. It's like $20 if I remember correctly. Looks legit.

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