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Old 08-08-2009, 09:08 PM
jdpduke's Avatar
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Join Date: May 2009
Location: Denver
Posts: 16
1990 350 SDL Questions

Bought the thing 2 weeks ago, love it. New to MB and not mechanically inclined yet, but have the desire. Original engine (I have read all about the issues but the car is from a friend and has been solid for him). A few questions for you veterans:

1-what routine maintenance should I do and how often?
2-should I have a set of supplies at the ready for any expected issues
3-should I have the car checked out now that I have it? Does it need a purge or anything like that? Sorry about the amateur questions.
4-I think I may have "lifter tick". Beneath the heart warming diesel growling there is a metallic tapping that is higher in pitch and varies in frequency with the rpm. Please tell me this isn't a big deal (not a rod issue?).
5-tachymeter not working, sounds like I really need this instrument, unlike in my gas engine japanese import.

Thanks all. Love to be here.

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Old 08-08-2009, 09:41 PM
babymog's Avatar
Loose Cannon - No Balls
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
4: The rods don't "tick", and piston scuffing is definately a deeper sound also, sounds like lifters. Many of us run Mobil Delvac 1 / Turbo Diesel & Truck synthetic oil with good results in reducing/eliminating the tick after a few-thousand miles.

5: Most common cause is the OVP relay, do a search on OVP, it would affect ABS ASD and A/C also IIRC (does on the 124).

Gone to the dark side

- Jeff
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Old 08-08-2009, 10:57 PM
Unofficial wormcan opener
Join Date: Dec 2005
Location: Ashland, MA
Posts: 2,602
1. What has your buddy done for routine maintenance?

2. A spare 3.0 OM603 to drop in when needed.

x2 on the Mobil 1 5w40 Turbo Diesel Truck oil.

1987 300TD 309, xxx 2.8.2014 10,000 mile OCI

Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

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