1983 300SD Questions/Concerns
So about a month ago I purchased a 83' 300sd. I have been reading up some and watching a few videos, ect. I have some issues and concerns with the car which might help others out as well. I love the car and want to restore it and customize it. The tach is not working, as I have pinpointed it down to the tach amp under the hood needs to be replaced. Any good places to purchase this without spending 140.00? Well, when im driving down the highway, it seems as if the car is revving pretty high. Cant tell you the rpm but its pretty loud. I really dont feel comfortable bringing it above 65mph. I have adjusted the ALDA screw because of a very noticeable lack of power soon after I bought the car. Now it seems the cold starts are alot more rough, and sometimes motor shuts off completely. It has a decent amount of white smoke when cold and seems to go away a little after the motor warms up. The transmission seems to hesitate when cold as well, taking a second to shift up into 3rd and 4th. Its like it has a clutch, it will rev-up then go into gear. This happends with 4th every time whether cold or not. It seems to shift between the gears pretty fast as well, hardly giving 2nd a chance to build up? Anyway, main issues are the rough idle, white smoke, ALDA, transmission shifting and speed issues on the highway. Anybody got some insight for this noob? I love the car and want to get er running right. Car has 280k on the odo. Trying to get the car performing back to spec, and maby a few ideas on some upgrades as well as fixes for the issues.
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Turn it back where it was. The ALDA should be the absolute last thing touched when diagnosing low power. It will only mask any real problem then cause excessive black smoke when the real problem is resolved. |
On the timing issue for the camshaft and injection, also when you say
Retarded injection timing. Set it to 24-26*BTDC. |
The correct valve adjustment procedure is at:
Mercedes Diesel Valve Adjustment Procedure is this correct? |
Also, im guessing performing all of the above should correct the extremely rough idle? The original priming pump is leaking diesel down onto the drivers side motor mount. The mount looks pretty rough, so im guessing that should be replaced as well. Have any links to that, and is that a pretty difficult undertaking? I have a new style priming pump im guessing I should install pretty soon.......
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Okay, well I did what you said in regards to the ALDA
No, the only way to correctly calibrate it is with the pump on a test bench. The ALDA can be "close enough" adjusted by turning it until there is little to no visible smoke from the exhaust when the throttle is mashed from a standstill. CW reduces fuel available at low-boost, CCW increases. It will not alter maximum power. |
Originally Posted by ForcedInduction
(Post 159322)
Overboost protection.
When boost goes above 16psi the air signal to the ALDA is vented to prevent engine damage. Boost goes below 16psi and the cycle repeats. Check your wastegate hose. |
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