Idle adjusting for a 6-71DD N

[Trojan]

I need to adjust my idle on one of my engines. I had a DD man look at it. He took the governor apart and removed a quarter from it. He said it needs a new adjuster spacer plug. He said it needed a new spacer, but it was a try an see type thing and that I should just use it as it is. It would cost to much for him to do the try and see thing. It's not that it's that bad except that I don't like the idle above 450 RPMS and it now idles at 625 RPMS. I understand there are round cylinder spacers that come in different lengths that you must try and remove until you find the correct length to get the proper idle speed. He said the quarter was not the correct size to work as a shim. So the question is do I add to the spacer to lower the RPM or what. My books are on the boat so I need to ask the group before I dig in. I think there are only 2 bolts that hold the governor adjuster on. But I need to know which direction to go when I make my new spacers up to try. Also how much do you think I need to add on or remove to achieve my goal?

BILL

 

[Canuck Dennis]

I always thought that idle for those was 600-650 rpm. Don't mess with shims unless you rally know what you are doing...let the expert do it and if he seems hesitant, get someone else, for the right mechanic it's not difficult.

 

[captddis]

As noted the shims are for setting no load RPM. You do not set idle speed with the shims. You set idle speed with the buffer screw backed out and then use the idle screw. Your mechanic does not have a clue!

 

[Regal2800]

x2. The shims in the governor are used to adjust the no load max rpm. there is a buffer screw on the extrior of the engine. lose the jam nut and slowly turn the screw (i forgot which direction) and you can hear the engine RPM raise or lower. once the desired RPM is reached then tighten the jam nut. But these engines are designed to idle around 600 RPM. I think its actually bad for this engine if you lower it to 475rpm.

 

[Canuck Dennis]

Never use the buffer screw to adjust idle.....gezzzzzzz,,...read the manual or call someone who knows...

 

[Regal2800]

Sorry adjustment is with the Idle adjustment screw. (Got my terms mixed up)

 

[Trojan]

I guess I need to get the book off the boat. When it stops raining or snowing. Thanks guys. This weather sucks!

BILL

 

[SKYCHENEY]

So much for braggin' about being the first one in this spring, eh Bill?

 

[Genevatexan]

The idle adjustment screw on the governor for my 671 T was on the back side of the governer (towards tranmission) almost under the plate that supports the stop solenoid. You do not have to open the governor inspection plate. There is a threaded shaft with a slot head and a keeper nut. My multifit manual was convoluted but a tenacious read will get you to a picture of the screw and instructions on the buffer screw, the cold start assist screw, and the idle screw. We did nothing more than simply release the retainer nut and rotated the threaded shaft with a screwdriver a very few degrees to bring it down to the 625 range. Its was previously about 750. I removed the plate that holds the stop solenoid to see it better.