[MBZ] Monovalve insert.
W123 (and BMW etc.) Monovalve insert, called a "magnet" in the EPC.000 835 06 44FCP Euro $20 probably UroAutohausaz ~ $15.12 probably UroMBZ $206.40 genuine? Fred Moir.Lynn MA.Diesel preferred. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Monovalve insert
The valve uses an electromagnet to drive the plunger up & down. I wonder of the thick steel washer is needed to complete the magnetic circuit? If so then stainless steel will not work. Thanks, Tom Hargrave www.kegkits.com 256-656-1924 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Glenn M. Brown Sent: Saturday, January 06, 2007 2:43 PM To: mercedes@okiebenz.com Subject: [MBZ] Monovalve insert Re: Message: 12 Date: Fri, 5 Jan 2007 22:48:21 -0800 From: Jim Cathey <[EMAIL PROTECTED]> Subject: Re: [MBZ] Monovalve insert To: Mercedes Discussion List Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=US-ASCII; format=flowed > Of the three washers sitting on top of the monovalve insert shaft, I > had lost the 1st one in '96 but all seemed to work OK with just the > wavy steel washer and the wide, thick washer on top. When I recently > replaced the monovalve insert, I found a thin washer to place on 1st > and on top of this placed the wavy steel washer and a wide thick > stainless washer. The top seemed to sit on flush with the monovalve > housing prior to installing/tightening the four screws. Results - > heat only in defrost mode, all other settings heat would disppear > suggesting... Remember that the monovalve is a PWM device, and needs to move back and forth up to about once a second (or a bit slower). If the 'wrong' washer business screws up its mechanical response time, either due to sapping magnetic field or due to locating the guts of the monovalve incorrectly, you could well get a valve that doesn't work right for PWM but can let coolant through when completely unpowered (as it is for DEFROST). -- Jim I just got back from taking the 300D for a ride to determine if the current washer combination on the monovalve insert would get me back to regulated heat (Note: The 1st washer replaces the original which I lost in '96 and is a thin one I found at Sears, the 2nd washer is the standard wavy steel washer which comes with the monovalve repair kit, and the top washer is the original thick, wide steel washer). Viola, I've got regulated heat again. The only problem here is trying to understand why. You see, all was working OK with only the wavy steel washer and the original thick, wide steel washer on top prior to the crack/tear in the neoprene diaphragm of the monovalve. Since the original thick, wide steel washer on top was somewhat corroded, I decided to replace this with a stainless washer when I replaced the monovalve insert, but this replacement stainless washer wasn't exactly the same size as the original. After installing the first thin washer, which I found at Sears, the wavy steel washer, and the stainless replacement washer with the new monovalve insert, I had no regulated heat on a trip from Pbgh. to Roch. and only had heat on the defrost setting. I've now replaced the replacement stainless top washer with the original steel top washer which I POR-15nd*. This combination appears to work and there doesn't seem to be any leaks at the housing even though the top doesn't sit flush (~1/16"?) on the housing prior to tightening the four screws. Here's the weird part: Thickness (mm) ID (in.) OD (in.) Original 1st (bottom) washer? ?? Wavy steel (middle) washer 0.45 3/4" 1 1/4" Original 3rd (top) washer*2.45 5/8" 1 1/2" Sears thin washer (1st repl.)1.12 5/8" 1" Stainless top (repl.) washer 25/8" 1 3/8" Prior to the crack/tear in the neoprene diaphragm of the previous monovalve, the washers in place total ~ 2.9mm and I had regulated heat prior to the neoprene diaphragm cracking/tearing. After replacing the monovalve insert and using a different combination of washers totaling ~ 3.57mm, I had no regulated heat and only had heat on the defrost setting. The current combination of washers installed total ~ 4.02mm and regulated heat appears to be functioning properly. Go figure. G. M. Brown Rochester, NY ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Monovalve insert
Re: Message: 12 Date: Fri, 5 Jan 2007 22:48:21 -0800 From: Jim Cathey <[EMAIL PROTECTED]> Subject: Re: [MBZ] Monovalve insert To: Mercedes Discussion List Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=US-ASCII; format=flowed > Of the three washers sitting on top of the monovalve insert shaft, I > had lost the 1st one in '96 but all seemed to work OK with just the > wavy steel washer and the wide, thick washer on top. When I recently > replaced the monovalve insert, I found a thin washer to place on 1st > and on top of this placed the wavy steel washer and a wide thick > stainless washer. The top seemed to sit on flush with the monovalve > housing prior to installing/tightening the four screws. Results - > heat only in defrost mode, all other settings heat would disppear > suggesting... Remember that the monovalve is a PWM device, and needs to move back and forth up to about once a second (or a bit slower). If the 'wrong' washer business screws up its mechanical response time, either due to sapping magnetic field or due to locating the guts of the monovalve incorrectly, you could well get a valve that doesn't work right for PWM but can let coolant through when completely unpowered (as it is for DEFROST). -- Jim I just got back from taking the 300D for a ride to determine if the current washer combination on the monovalve insert would get me back to regulated heat (Note: The 1st washer replaces the original which I lost in '96 and is a thin one I found at Sears, the 2nd washer is the standard wavy steel washer which comes with the monovalve repair kit, and the top washer is the original thick, wide steel washer). Viola, I've got regulated heat again. The only problem here is trying to understand why. You see, all was working OK with only the wavy steel washer and the original thick, wide steel washer on top prior to the crack/tear in the neoprene diaphragm of the monovalve. Since the original thick, wide steel washer on top was somewhat corroded, I decided to replace this with a stainless washer when I replaced the monovalve insert, but this replacement stainless washer wasn't exactly the same size as the original. After installing the first thin washer, which I found at Sears, the wavy steel washer, and the stainless replacement washer with the new monovalve insert, I had no regulated heat on a trip from Pbgh. to Roch. and only had heat on the defrost setting. I've now replaced the replacement stainless top washer with the original steel top washer which I POR-15nd*. This combination appears to work and there doesn't seem to be any leaks at the housing even though the top doesn't sit flush (~1/16"?) on the housing prior to tightening the four screws. Here's the weird part: Thickness (mm) ID (in.) OD (in.) Original 1st (bottom) washer? ?? Wavy steel (middle) washer 0.45 3/4" 1 1/4" Original 3rd (top) washer*2.45 5/8" 1 1/2" Sears thin washer (1st repl.)1.12 5/8" 1" Stainless top (repl.) washer 25/8" 1 3/8" Prior to the crack/tear in the neoprene diaphragm of the previous monovalve, the washers in place total ~ 2.9mm and I had regulated heat prior to the neoprene diaphragm cracking/tearing. After replacing the monovalve insert and using a different combination of washers totaling ~ 3.57mm, I had no regulated heat and only had heat on the defrost setting. The current combination of washers installed total ~ 4.02mm and regulated heat appears to be functioning properly. Go figure. G. M. Brown Rochester, NY
Re: [MBZ] Monovalve insert
Of the three washers sitting on top of the monovalve insert shaft, I had lost the 1st one in '96 but all seemed to work OK with just the wavy steel washer and the wide, thick washer on top. When I recently replaced the monovalve insert, I found a thin washer to place on 1st and on top of this placed the wavy steel washer and a wide thick stainless washer. The top seemed to sit on flush with the monovalve housing prior to installing/tightening the four screws. Results - heat only in defrost mode, all other settings heat would disppear suggesting... Remember that the monovalve is a PWM device, and needs to move back and forth up to about once a second (or a bit slower). If the 'wrong' washer business screws up its mechanical response time, either due to sapping magnetic field or due to locating the guts of the monovalve incorrectly, you could well get a valve that doesn't work right for PWM but can let coolant through when completely unpowered (as it is for DEFROST). -- Jim
[MBZ] Monovalve insert
Some of you may have found out about this first part some time ago. Since the monovalve insert neoprene diaphragm seems to crack/tear on a regular basis of between 3-5 years, I contacted a representative at Robert Bosch to see if the neoprene parts associated with the monovalve insert are available separately . . . the short answer, no. The reason I was interested in this is that I replaced the monovalve insert shortly after I purchased my '84 300D turbodiesel in '96, again in 2001, and I had to replace it again just recently. Of the three washers sitting on top of the monovalve insert shaft, I had lost the 1st one in '96 but all seemed to work OK with just the wavy steel washer and the wide, thick washer on top. When I recently replaced the monovalve insert, I found a thin washer to place on 1st and on top of this placed the wavy steel washer and a wide thick stainless washer. The top seemed to sit on flush with the monovalve housing prior to installing/tightening the four screws. Results - heat only in defrost mode, all other settings heat would disppear suggesting 1) There was either a crack/tear in the new monovalve insert I installed, or 2) Something in the overly complex electrical part of this lousy ACC system went south. I have trouble believing #2 as it would be too conincidental. I opened up the monovalve again and inspected the new monovalve neoprene diaphragm I installed and found no cracks/tears. I replaced the top wide thick stainless washer with the original wide thick steel washer and the top plate does not sit flush with the monovalve housing prior to tightening the four screws but, after tightening the four screws, there doesn't appear to be any leaks at the monovalve housing after starting the engine and operating the ACC on either defrost or off. If this works and I've got my regulated heat back, I'll report back. Otherwise, if someone out there has a clue please let me know what may have gone wrong. I'm hoping that one of these days I may actuallty understand this lousy system. TIA. G. M. Brown Rochester, NY
[MBZ] Monovalve insert small washer
The monovalve insert on my '83 300D is supposed to have three washers (A small thin one, a wavy sping steel one in the middle, and a larger diameter thicker one on top). Somewhere along the line I managed to lose the small thin washer and, since I'm in the process of replacing the monovalve insert for the third time in less than 10 years, I'm wondering if the absence of this other washer causes undue stress on the neoprene diaphragm and thus premature failures? So if anyone out there may have an extra one of these small washers, it would be greatly apprecaited as I haven't been able to locate this at a specialized fastener place I frequent. TIA. G. M. Brown Rochester, NY
Re: [MBZ] Monovalve insert
Does anyone out there in listland have a picture or diagram of the internal order of things of a monovalve in an '84 300D Turbo which they can send me No, I don't. But there _are_ three washer things. I lost one down between the firewalls once. Two flat washers and the wavy spring washer. -- Jim
[MBZ] Monovalve insert
Does anyone out there in listland have a picture or diagram of the internal order of things of a monovalve in an '84 300D Turbo which they can send me offlist? Since I purchased this car in '96, this is the second monovalve repair I've needed. Since I haven't driven this car in the winter months until now, this doesn't say much for the reliability of this part. Upon opening things up, there is one somewhat fat washer encompassing the monovalve insert shaft, a flex/spring steel washer sitting on top of this, and the core winding sitting on top of these. I seem to recall that the first time I replaced this that there were three washers, or am I mistaken? TIA G. M. Brown Rochester, NY
