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Discussion Starter #1
Project continues.
This afternoon decided to clean air metering plate and assembly.
FA8709F8-51D7-4990-A506-15B773688E01.jpeg
Some cleaning foam and high pressure wash later
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Discussion Starter #2
Air meter plate still not as ‘smooth’ in operation as I would like, I might have to do a more thorough strip down.

Throttle body was terrible, almost every vacuum port was blocked.
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1991 420 SEL
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I like the before and after pics - it's like, 'ta-da!'

Very nice.

Pete
 

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Discussion Starter #4
Yes certainly cleans up well. Gradually doing all the parts before they go back on the engine.
 

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Discussion Starter #5 (Edited)
Arrived this morning, although appears to be wrong part. I did check part numbers before ordering and it said it was right for my car.
Part number ordered: A1102001920
Appreciate if anyone has the correct part number ?
B1EE3D10-D862-4432-8BD5-4BBD1E57039E.jpeg F1AD2CAE-788E-4D72-9A4D-1E2E1803132A.jpeg AC99B00E-07F7-4917-9A35-FC06B210C511.jpeg
 

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Discussion Starter #6
All heater hoses replaced today. Below is the hoses from the heater control valve. There is also the main heater supply and return lines which were likely the ones that needed replacing the most. You could see signs of fatigue and not the best idea on a long hot run. Supply line would likely fail near the block and would be almost impossible to replace without a hoist or ramps. B5C24FEA-AA1B-409E-AF0C-F77D86FF4EE4.jpeg
 

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1991 500SEC 55K mi. 1987 560SEC Now 153K mi. 2020
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Arrived this morning, although appears to be wrong part. I did check part numbers before ordering and it said it was right for my car.
Part number ordered: A1102001920
Appreciate if anyone has the correct part number ?
View attachment 2643129 View attachment 2643130 View attachment 2643131
I found this by doing a Google search by application: 'water pump for 280se'

This from PartsGeek

Screen Shot 2020-07-26 at 7.47.20 AM.png

At least there are some interchange references for you & hopefully available locally.

M
 

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Discussion Starter #8
Hello again, you are of so much help !

I ended up getting another pump. Its on route. Will post pic when arrives for reference. Should be right this time.
 

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Discussion Starter #14
When I removed the Throttle body I removed the TPS. In hindsight this was a good thing so I could properly clean the gunked up throttle body which I used a pressure washer and lots of Degreaser.

Setting the TPS is relatively simply. It is only a simple three wire device. Essentially a dual switch which breaks continuity across one wire when throttle is just cracked open. And creates continuity across the alternate wire when WOT is reached.

tps1.jpeg tps2.jpeg tps3.jpeg tps4.jpeg
 

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Discussion Starter #15
Note I used a feeler gauge between the throttle stop and butterfly lever. I managed to get very tight in tolerance and continuity was broken with just a 0.05 mm feeler gauge. Whether that is factory specs or not ?? The main thing is the TPS now works as supposed to, Throttle CLOSED, OPEN and WOT.
 
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