Team-BHP > Vintage Cars & Classics in India > Post-War


Reply
 
Search this Thread
Old 10th January 2018, 13:07   #136
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by layzone View Post
Is there a group on whatsapp for Mercedes owners & enthusiast in India, Which could help communicate with each other faster.
Bowman hope I am not hijacking your post.
Not at all mate. This is not my thread but this is a thread for all things related to Old School Mercedes.

If there is any such group I would be interested as well. So long as the discussion is restricted to all things cars :-)
BowMan is offline  
Old 14th October 2018, 13:09   #137
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

I feel I have been away from this post for a long time. But I have not been away from my car. So like all car enthusiasts it was time for me to enjoy the therapeutic qualities of an oil change.

The best Oil I could find, and of course a new filter.

'83 Mercedes 240D - My W123 Restoration Diary-43950897_330030654212830_3967801044150255616_n.jpg

'83 Mercedes 240D - My W123 Restoration Diary-43952367_761831967492151_2163423641730023424_n.jpg

Also new oil pan bolt. Again sourced at local spares shop along with crush washer.

'83 Mercedes 240D - My W123 Restoration Diary-44054641_285099365455054_2452680540835282944_n.jpg

Also managed to find these O Rings that maintain oil pressure. These are very important component of the lubrication system and often ignored. Mine were so brittle when I tried to pry them open the damn thing just cracked. I managed to get these at a rickshaw spare shop. Now that's interesting. The humble Bajaj Rickshaw comes to air of the Merc

'83 Mercedes 240D - My W123 Restoration Diary-43770212_169513603977593_6209879688987279360_n.jpg

Also changed the rear tranny oil and gear oil. Just to mention, Mercedes recommends Autmatic Transmission Fluid in its Manual Gearboxes. However I use proper hypoid 90wt gear oil.
BowMan is offline   (2) Thanks
Old 14th October 2018, 14:21   #138
Distinguished - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 6,527
Thanked: 31,403 Times
Default

Quote:
Originally Posted by BowMan View Post
I]



Also managed to find these O Rings that maintain oil pressure. These are very important component of the lubrication system and often ignored..

Good job!
Where do these O rings sit. Part of the pump or so?
Thanks
Jeroen
Jeroen is offline  
Old 14th October 2018, 19:51   #139
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by Jeroen View Post
Good job!
Where do these O rings sit. Part of the pump or so?
Thanks
Jeroen
Like so at the end of Oil Filter Shaft, the two of them.

Name:  oil filter flow path post01rot.jpg
Views: 2518
Size:  176.3 KB

I believe when these go bad the bypass threshold drops and you leak clean pressured oil and instead of the oil reaching engine some of it drops into the oil pan. SOme more information here. https://www.benzworld.org/forums/w12...ft-o-ring.html
BowMan is offline  
Old 14th October 2018, 20:52   #140
Distinguished - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 6,527
Thanked: 31,403 Times
Default

Quote:
Originally Posted by BowMan View Post
Like so at the end of Oil Filter Shaft, the two of them.



Attachment 1807822



I believe when these go bad the bypass threshold drops and you leak clean pressured oil and instead of the oil reaching engine some of it drops into the oil pan. SOme more information here. https://www.benzworld.org/forums/w12...ft-o-ring.html

This is the clogged oil filter by pass valve. If the filter clogs badly and thus creates too much back pressure this valve opens and the oil or parts of the oil are diverted around the filter. Better dirty oil going into the engine than no or too little oil.

Jeroen
Jeroen is offline  
Old 15th October 2018, 09:14   #141
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

That is what is labelled 23 in the above diagram. Here is a another one (where it is 19). The lower O Ring ( leads to 'c', 'fine filtered oil to oil pan' and the upper one leads to 'd' which is 'oil return flow bore to oil pan'.

When these become stiff and non-pliable the pressure release across these O rings stops. This results in a higher pressure across the check valve which then activates earlier in the crank cycle when there is a surge in oil pressure sending more dirty oil to the engine and more clean oil to the pan.

Name:  Chap18_005pic.jpeg
Views: 2384
Size:  66.8 KB

Another interesting feature of the design is the bypass mechanism is part of the filter housing and not the actual filter as in modern spin type filters. I'm sure there must be advantages of the newer design but to me it makes good sense for the car manufacturer to have a greater control over such specifications rather than filter manufacturers. I am aware that different filter manufacturers for the same applications will have slightly different pressure thresholds.

Last edited by BowMan : 15th October 2018 at 09:23.
BowMan is offline   (1) Thanks
Old 21st October 2018, 10:48   #142
BHPian
 
Join Date: Apr 2010
Location: Pune, Bahrain
Posts: 450
Thanked: 84 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by BowMan View Post
Not at all mate. This is not my thread but this is a thread for all things related to Old School Mercedes.

If there is any such group I would be interested as well. So long as the discussion is restricted to all things cars :-)
The MBIO has a whatsapp group for various cities and one for Pan India.
kevinephraim is offline  
Old 28th October 2018, 14:27   #143
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by kevinephraim View Post
The MBIO has a whatsapp group for various cities and one for Pan India.
Is it mostly about the Oldtimers/Youngtimers? If yes I would like to perhaps join the group.
BowMan is offline  
Old 30th October 2018, 12:09   #144
BHPian
 
Join Date: Apr 2010
Location: Pune, Bahrain
Posts: 450
Thanked: 84 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by BowMan View Post
Is it mostly about the Oldtimers/Youngtimers? If yes I would like to perhaps join the group.
PM me and I'll put you on. It's for all years and models of Mercedes owners, but I think there is one for just the oldtimers and youngtimers as well.
kevinephraim is offline  
Old 23rd March 2019, 01:44   #145
BHPian
 
Vmax1200's Avatar
 
Join Date: Mar 2019
Location: Cochin
Posts: 112
Thanked: 509 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by BowMan View Post
I feel I have been away from this post for a long time. But I have not been away from my car. So like all car enthusiasts it was time for me to enjoy the therapeutic qualities of an oil change.
The best Oil I could find, and of course a new filter.

Does synthetic oil make noticeable difference in W123?

Last edited by ajmat : 23rd March 2019 at 13:38. Reason: fixing quote
Vmax1200 is offline  
Old 23rd March 2019, 12:59   #146
Distinguished - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 6,527
Thanked: 31,403 Times
Default

Quote:
Originally Posted by Vmax1200 View Post

Does synthetic oil make noticeable difference in W123?

No, not so far as I have heard. Everybody I know uses just mineral oil, some might go for a semi-synthetic. All W123 engines are build to last and they have, just with mineral oil

Last edited by Akshay1234 : 24th March 2019 at 10:48. Reason: Editing quote
Jeroen is offline   (1) Thanks
Old 25th March 2019, 09:56   #147
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by Vmax1200 View Post
The best Oil I could find, and of course a new filter.

Does synthetic oil make noticeable difference in W123?
Well, it did make my engine feel a bit smoother. But there is no way of telling if this is placebo or real. And as always regular change intervals is much more important.

I have a rebuilt engine, new piston, rings, sleeves, top end, so the first oil I ran was a good mineral oil (Mobil Delvac) and then changed over to synthetic. But I'd probably be equally happy to run her on Delvac all the time.
BowMan is offline  
Old 25th March 2019, 12:36   #148
Distinguished - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 6,527
Thanked: 31,403 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by BowMan View Post
Well, it did make my engine feel a bit smoother. But there is no way of telling if this is placebo or real. And as always regular change intervals is much more important.
NO offence, personally, I think it is placebo effect. I am always amazed when people report changing to a synthetic oil next engines revs better, FE improves, accelerates better, less noisy. This stuff is akin to snake oil!

Make sure to fit a good oil filter, just as important as oil change if not more important.

Jeroen
Jeroen is offline   (2) Thanks
Old 25th March 2019, 15:52   #149
BHPian
 
Join Date: Dec 2013
Location: Gandhinagar
Posts: 239
Thanked: 567 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by Jeroen View Post
NO offence, personally, I think it is placebo effect. I am always amazed when people report changing to a synthetic oil next engines revs better, FE improves, accelerates better, less noisy. This stuff is akin to snake oil!

Make sure to fit a good oil filter, just as important as oil change if not more important.

Jeroen
I bought the Mobil 1 5W50 because it is among the highest ZDDP concentration oils available. Since ZDDP is one of the primary friction modifiers and ZDDP breaks down with use, I'm not sure if it is just placebo or a real noticeable change. I have no data to support or refute either view.

Maybe we can do an experiment where we have one group of car owners who get an oil change and other do not, and we tell them both that we have changed oil. So a control experiment. And maybe also have scientific instruments that measure engine noise/vibrations.
BowMan is offline  
Old 25th March 2019, 16:05   #150
Distinguished - BHPian
 
Join Date: Oct 2012
Location: Delhi
Posts: 6,527
Thanked: 31,403 Times
Default Re: '83 Mercedes 240D - My W123 Restoration Diary

Quote:
Originally Posted by BowMan View Post
Maybe we can do an experiment where we have one group of car owners who get an oil change and other do not, and we tell them both that we have changed oil. So a control experiment. And maybe also have scientific instruments that measure engine noise/vibrations.
That would be interesting.
On the other hand. These engines have been known to easily clock 500K with no overhaul, running on mineral oil. Why even bother?

Jeroen
Jeroen is offline  
Reply

Most Viewed
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Copyright 2000 - 2022, Team-BHP.com
Proudly powered by E2E Networks