560SL engine - rebuild or replace? - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 06-20-2019, 02:20 PM Thread Starter
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560SL engine - rebuild or replace?

My 1986 560SL has just been diagnosed with major loss of pressure in 2 cylinders - not top end so full rebuild the only option...or is it? Car has 100k+ on it. Should I be thinking of just dropping a replacement sourced s/h lower mileage unit, from an SEL say? Is this better economic sense than rebuilding an old tired one? Thoughts please and any leads on sourcing one if you can help....I am based in NY state. What sort of money are we looking at for this job. I have a rough idea from England but dont know US times and costs. I dont have the tools here to take it on.

Not very happy as was about to sell her anyway....grrrrr. Any one want a project?!!!!!
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post #2 of 9 (permalink) Old 06-20-2019, 04:59 PM
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Originally Posted by CambridgeV8 View Post
My 1986 560SL has just been diagnosed with major loss of pressure in 2 cylinders - not top end so full rebuild the only option...or is it? Car has 100k+ on it. Should I be thinking of just dropping a replacement sourced s/h lower mileage unit, from an SEL say? Is this better economic sense than rebuilding an old tired one? Thoughts please and any leads on sourcing one if you can help....I am based in NY state. What sort of money are we looking at for this job. I have a rough idea from England but dont know US times and costs. I dont have the tools here to take it on.

Not very happy as was about to sell her anyway....grrrrr. Any one want a project?!!!!!
Who diagnosed it?

100K miles is not much. It will be difficult to find a lower mileage replacement.

Converting a 126 configuration engine to 107 configuration will not be cheep or as easy as it looks.

Rebuilding will be well north of $10,000 unless you do it yourself.

If you really need an engine a good used one is the best bet.
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post #3 of 9 (permalink) Old 06-20-2019, 06:46 PM
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+1 on the question of who diagnosed it? How did they determine it isn't top end? And even if it is piston or cylinder related... how does that mean full rebuild is the only option?

Hard to believe that a 560 with only 100K under it's belt is old and tired.

We need more information. What are the symptoms?

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post #4 of 9 (permalink) Old 06-21-2019, 05:08 AM Thread Starter
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thanks for responses. Local garage did leakdown test. Car running poorly - lumpy. New HT leads and plugs fitted.
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post #5 of 9 (permalink) Old 06-21-2019, 05:38 AM
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That isn't nearly enough to condemn the engine. There's a lot more that needs to be checked before making a diagnosis. You haven't even scratched the surface.

The good people of this forum will guide you through the process.

Good luck.

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post #6 of 9 (permalink) Old 06-21-2019, 11:15 AM
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Disregarding exchange rate, typically shop rates in NYC will match the "numbers" of what you'd see charged in greater London.

The lower end is typically bulletproof. I'm willing to bet bad valve stems. A jumped timing chain maybe? Though I feel there would be a lot more wrong at that point.

I would get a second opinion. Harbor freight sells cheap tools to do work yourself if you want to confirm the results.
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post #7 of 9 (permalink) Old 06-21-2019, 01:11 PM
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Do a wet and dry compression test to see if rings or valves. Entirely likely just need valve job. Of course while you are there included all rubber parts, timing chain and guides. you say "not top end" did mechanic do a wet/dry test? Can you post the test results?

What are you plans for car and what overall condition? If it is a great car and you are keeping, then do the work.
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post #8 of 9 (permalink) Old 06-24-2019, 12:13 PM Thread Starter
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thanks for these comments and sorry for tardy reply - working on another non-car project (piano!). Still at garage as brake booster failed too. I am going to get her back and taken to a couple of very knowledgeable chaps on the forum who can hopefully do further investigation. I feel it is top not bottom end. AFAIK timing chains never done BUT no noise, rattles, smoke etc. Idles at 500, just rough now.

I want to keep her as she is lovely looking, no rust etc BUT young child requires rear seat so an alternative convertible is now sought....
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post #9 of 9 (permalink) Old 06-27-2019, 08:47 AM Thread Starter
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Anyone recommend a knowledgeable independent garage within 50 miles of RyeNY/Greenwich CT who will understand my 560 engine and perhaps be able to give me some answers without charging me a fortune?

Rare as a rare thing I know but I had to ask....
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