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Need a little help with the 420 sel!
I have bought a 1987 420 sel. my problems are ...1) I have to fill it up with oil more than twice a week. 2) my fan makes funney sounds and starts and stops spinning(I think i need a fan cluch). 3)idle problems. However bad this sounds, the car runs good. I'am trying to restore the best i can. I put new brakes,spark plugs and wires,distruber,oil change with filter,new gas filter, transmission filter and front end alignment.MY questions are, what can i do to stop useing so much oil every week. i have 180,000 on this car and i want to keep it. Any insight would be very helpful.....
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#2
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English Comp 101
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2. Which fan, the electric one in front of the radiator or the engine driven one? 3. Is the check engine light on? I have yet to figure out how to read codes from these cars. There are many reasons for your idle problems. I'll get back to you on this. Have you replaced any front end parts, ball joints, bushings etc?
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Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952. |
#3
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in the engine and after that I haven't had to top up between oil changes. Its in a metal can and costs about 10 bucks. |
#4
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420 Sel
As far as the oil consumption goes Pull the heads ,replace the guides and stem seals reface the valves and seats and replace the timing chain and tensioner.
Unless the engine has been severly overheated the block and rings will be fine. Regarding the fan; a properly working fan clutch will come in and based on temperature and RPM, If you have doubts about it have it checked out. Good luck Mike |
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"It's normal for these things to empty your wallet and break your heart in the process." 2012 SLK 350 1987 420 SEL |
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I would like to say thank's for all the help and i will not give up on this wonderful machine! I will check all the easy stuff first cause i do not have
a bunch of money,but i can make it happan. thanks for all the help |
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I have two 87 420s. They are without a doubt one of the finest cars MB every built. Having said that, you need to be a better than average mechanic to keep them up without spending a fortune on labor. Most things can be done yourself and anything your not sure of, you can find many opinions and answers on this web site....it's a great place to talk to people and find solutions. I have saved myself tons of money by searching threads and finding short cuts to various problems. I think the number one thing to remember with these cars is to change the timing chain and guides every 100,000 miles. I have 240,000 on my blue car and did a valve and guide job at 201,500. The lower end of these engines are pretty bullet proof if properly maintained through oil changes. I do everything myself. I am about to change out the transmission on my blue car in my garage. It is the original one and getting a little loose. Fast idles are coupled with several reasons that are answered thought various threads. Simple checks include throttle cable, cruise ctl amp, etc. Oil usage sounds like a head job is needed. Once you do that the car will amaze you with performance. good luck...
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Dave Bunker 1987 420SEL, 180k strong Blu & Grey 2004 Road King Custom Sacramento, CA tvbunk@comcast.net |
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I would start with a fresh oil change, and clean the engine to see where any leaks are coming from. Diluted and old oil can cause high consumption, and the valve cover gaskets are prone to leak.
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Oil
You should tell us is the engine oily or is the car really using it? Sounds like a large leak,or use,though we don't know what kind of mileage you are talking about.JNT
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I often hear of the 4.2L V8 using/leaking oil, but not too much about the 3.8L using/leaking oil. Same story for my 380SE (3.8L), as I have nearly 270K and I do not have any oil leaks/usage.
What was the change on the 4.2L that seems to be causing this? I was thinking of someday upgrading to a 420SEL and would like to know. |
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oil leak or use?
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