83' 300sd High Idle - PeachParts Mercedes-Benz Forum

92300SE · #1 10-07-2007, 07:51 PM

I dont remember how to lower the idle on the 5cyl. turbo diesels,81-85,mine idles close to 1000 rpm for some reason,its not like the newer ones,6 cyl.,86-87 with the knob in front of the brake master cylinder.Is there any adjustment at the pump?

toomany MBZ · #2 10-08-2007, 05:19 AM

Yes, there is an adjustment bolt on the side of the IP, between it and the head. A long bolt head looking thing, there is a lock nut on the bottom. I think the idle should be at 750 rpm.

argus445 · #3 10-08-2007, 08:10 AM

Quote:

Originally Posted by toomany MBZ

Yes, there is an adjustment bolt on the side of the IP, between it and the head. A long bolt head looking thing, there is a lock nut on the bottom. I think the idle should be at 750 rpm.

I installed a tiny tach like 2 weeks ago i was curious if the adjustment was cold or normal operating temp? And does it vary any from when u first start to when it warms up? mine seems to show like 60-70 rpm diff or so it would seem thanks

toomany MBZ · #4 10-08-2007, 02:31 PM

Quote:

Originally Posted by toomany MBZ

Yes, there is an adjustment bolt on the side of the IP, between it and the head. A long bolt head looking thing, I've just checked, it's solid round with a screw driver slot on top just behind fuel shut off linkage there is a lock nut on the bottom. I think the idle should be at 750 rpm.

aargus445, adjusting cold is fine, I'm not familiar with a "tiny tach", are you sure it's providing an accurate reading?