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  #106  
Old 01-12-2018, 10:20 PM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 2,648
The big ticket item though turned out to be the water pump. For a long time there has been an intermittent soft squeak noise in time with one of the cylinders firing only when the engine is hot. I had the hardest time tracking down what it was and was beginning to suspect I had a wrist pin squeaking or a camshaft bearing trying to seize.

Nope.

It was the water pump bearings. When I had the belt off to do the OAP, I spun the water pump and was rewarded with a horrible rumbling noise with a squeak as it came to a stop. Great......

Reading up in the FSM on how to do the job, it didn't seem like a big deal, just spin off the fan clutch, remove the pulley, and unbolt the pump. Easy right? Wrong. Apparently the fan clutch had been replaced at some point in the past and the monkey that installed the new one had Hercules tighten the bolt. There was no possible way it was ever coming out with mere mortal tools. Read about that clusterf**k here: 603 Fan Clutch Bolt Rounded Out - Now What...

Since I had to ruin the clutch to get it off, I decided it was prime time to upgrade to the OM606 11 blade fan and clutch from a '99 E300D. The 606 parts will bolt up to a 603 no problem and the later clutch cuts in at a lower temperature than the original 603 part did.

The interesting part is that the 606 fan FEELS heavier than the original 9 blade aluminum fan, but it's 1/3 of a pound lighter! I finally got the parts in today and got the car back together and back on the road. After driving the SL and the Honda for the last 2 weeks, it's remarkable how smooth and quiet the SDL is in comparison. The SL is a bit rough and ready, but the Honda is pretty smooth and refined. The SDL is in a whole different class...

The good news is that there's no leaks (yet) and the engine is SOOOOOO quiet when on the road. It's amazing how much noise that water pump was making! It just sounded like engine noise!

I also did an experiment with a P/S leak. The return lines were all leaking at the clamps. Having been through that mess in the SL, I didn't waste my time tightening them, I just replaced them all with worm clamps. That stopped that leak, but I had another unusual leak on the steering box itself. No leaks from any of the shaft seals, but it was leaking from the joint where the top plate bolts to the box itself. Weird... I drained the P/S fluid out and refilled with Valvoline Max-Life ATF and half a bottle of Lucas P/S stop-leak. Time will tell the tale, but for now it seems to have stemmed the tide.

And of course this evening, the brake lining light decides to come on as I come to a stop at a traffic light. Looks like front brake pads are next on the agenda. It's always something...
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The "Diseasel" - '86 300SDL-img_1841.jpg   The "Diseasel" - '86 300SDL-img_1842.jpg   The "Diseasel" - '86 300SDL-img_1844.jpg   The "Diseasel" - '86 300SDL-img_1846.jpg  
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'11 Honda Accord EX - "The Daily" 60K
'83 500SL Euro - "The Money Pit" 116K
'86 300SDL - "The Diseasel" 180K
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Delivery Valve as Source of Nailing Thread
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  #107  
Old 01-13-2018, 11:18 PM
vwnate1's Avatar
Diesel Dandy
 
Join Date: Nov 2005
Location: Sunny So. Cal. !
Posts: 2,292
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The OM 616 & 617 water pumps are often 'fun' too ~
I wish I'da known about that OM606 up grade fan blade when we replaced the head on brothers '87 300SDL, the pump and other little tings were all lifed out and I tried to up date as we went along .

Agreed, the W126 Diesels are so much quieter than the older W123's are .

I'd love to stuff an OM603 into my old Chevy C/10 shop truck .
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1982 240D creampuff 367,000 miles (SWMBO's)
1978 300CD back from the dead SOLD
1980 300CD 90K Miles ICE COLD AC ~ SOLD
1984 300CD KEEPER ! 420,XXX miles
1984 Euro 300TD Fully optioned
1974 350SLC 4 speed stickshift SOLD & missed
Krazy Kommie Ural Motos (3)
BMW Motos /5's SOLD
Vintage Air Cooled VW's all gone =8-(
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  #108  
Old 01-14-2018, 12:34 AM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 2,648
The water pump was super easy, it was that stupid clutch that was the biggest issue. Had the bolt come out like it was supposed to, it would have been a 2 hour job, but that isn't how this car works.

The 606 clutch/fan is a somewhat common upgrade. The bimetal cuts in at a slightly lower temperature than the 603 design does. There are 2 different clutches/fans for the 606 too. There's the 9 blade for the N/A engines and the 11 blade for the turbo engines. I went with the 11 blade turbo version for the extra airflow.

Went for a short road trip earlier with interstate driving which usually sees the temperature climb on hills, even in cooler weather. No such thing today. Despite being 62˚ today, the temperature never budged, it stayed dead center in the temp gauge the entire trip.

It's really interesting how much quieter the car is on the road too. You just hear a low grumble of the engine and the tire/wind noise. The roar it had before is completely gone, was clearly the water pump this whole time! Sheesh!
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'11 Honda Accord EX - "The Daily" 60K
'83 500SL Euro - "The Money Pit" 116K
'86 300SDL - "The Diseasel" 180K
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Delivery Valve as Source of Nailing Thread
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  #109  
Old Yesterday, 10:26 PM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 2,648
New brake pads installed. Right front caliper was a rusty hulk and completely seized up solid. Once I hammered the brake pads out, the pistons slid back in the caliper like nothing was wrong, I suspect the pads were in a bind in the caliper, not the pistons sticking in their bores. With the new pads installed, no brakes dragging, no squealing, and no more idiot light on the dash! Fingers crossed there's a reduction in brake dust, the Textar pads that were on there were just obscene.
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'11 Honda Accord EX - "The Daily" 60K
'83 500SL Euro - "The Money Pit" 116K
'86 300SDL - "The Diseasel" 180K
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Delivery Valve as Source of Nailing Thread
Reply With Quote
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