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  #1  
Old 12-08-2004, 11:37 PM
DieselBone's Avatar
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Location: Mechanicsburg, Pennsylvania
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camshaft noise on 76 280C

Hello!

I have had my 280C now for about 6 years, and it seems like all of a sudden there is a noise when the car is idling (700-900RPM) it sounds like it coming from the top end of the engine, the noise also goes away from 1000RPMs on up??? Is my camshaft(s) worn??? I know the cams are supported by alum. towers, the top end is also getting lubed well. Any ideas????

Another question about this, I have an opp to buy a 73 250C parts car, body shot, good engine, how hard is it to fit that motor in my 280C???

Thanks for your help

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  #2  
Old 12-09-2004, 12:38 AM
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Join Date: Jul 2002
Location: Raleigh, NC currently residing in KL, Malaysia
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Hello,
At the risk of causing more problems then solving the initial, I am guessing that you have never done a valve lash adjustment in the six years and it may just need one.
IIRC, the US market 250C had the M130 engine which is a completely different animal BUT if both cars are the W114 chassis, it should be an easy swop.
Hope that helps.
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Old 12-09-2004, 09:15 AM
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Good idea to have a look at the valve lash, and to check for worn cam lobes. But it's just the nature of this beast to make strange noises in the top end that sort of come and go at different RPM. I have three and they all do it in various ways depending on engine temperature.

Going from an M110 to a M130 would not be a huge deal if you have the cars side-by-side. The main difference is that the carbs on the 130 are on the right, so there would be some work to re-route the fuel lines and linkage, and I believe you will need to move the battery.

Also

- the exhaust is different from the manifolds to the center muffler
- wiring needed for a second choke and carb shut-off solenoids
- unclear if the 130 distributor would work with the 110 transistor ignition
- there is a large amount of emissions stuff on the '76 that you would have no place to connect
- the transmissions are different (you would have to use the 130 trans) and the wiring for start and backup lights is different.
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'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 12-09-2004, 06:35 PM
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Just a thought, since you did not specify the kind of noise your are hearing. By all means check the clearances, but could you be hearing chain slap from a failed tensioner? If so, and the trained ear of good indy would be very helpful here, then you should immediately get it fixed, as in pronto. Much damage can result if the chain tensioner fails completely and the chain jumps.

For what its worth...

230/8
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  #5  
Old 12-13-2004, 12:11 PM
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I don't run the car that much, and the last time I did I didn't hear anything. I have the car with antique PA plates, so emissions isn't a factor with an engine switch. The noise is hard to discribe, its not a chatter, almost like a failing bearing in a tranny. I have an extra M110 laying around.......but I don't need to do anything yet......thanks for the replays!
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  #6  
Old 12-13-2004, 04:29 PM
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Rocker arms too.... look for two-tone metal at rubbing point where nickel surface has worn away leaving patch of darker steel surface that will eat up the cams.

Twin cam lobe wear is directly related to oil changes, valve clearances and condition of the rockers.

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