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  #1  
Old 11-28-2003, 12:18 AM
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Join Date: Nov 2003
Location: MD
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Question Single-to-double t-chain part 2

First, I'll say happy t-giving to everyone. Now a couple more ?s for some of the very helpful senior members: 82 380 sel. 3.8. I got the whole t-chain cover off w/o a problem: no broken bolts believe it or not. Prior to removing the cover, I set the timing to TDC "0" degrees via harmonic bal. the marks on both cams line up w/ the notches on the front cam bearings. Being that the car ran w/o a problem before teardown, would I need offset woodruff keys for the cams?:2,4,8 degrees. Or, should I leave them "straight-up" w/ the original keys? Assuming I preload the tensioner w/ oil as the febi direcs say, and use all new dble crank gears w/ new rails top and bott, is it safe to "not" off-set the cams. The chain is new also. What iam getting at is I don't have a degree wheel but am not using "used" parts for reassembly. When I get the new dble gears on the cams and the tentioner in position and have everything tight, will these marks on the cam alighn. I read in the man, I think, about the right cam being more advanced in normal running. I plan on turning the engine over w/ the bal on w/o plugs in a few times by hand. Could the right cam advance itself w/ the tentioner getting tighter filling w/ oil? Or will they always line up together at TDC. The car had 121k before I tore it down. The parts alone were $650 w/ h2o pump and I still need more misc items. Oh well it was free and I do like working on it too. Any other reassembly advice would be appreciated too. Thanks for the past pics too. Ill try to post some myself in the next couple of weeks and let you all know how it is going. les
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  #2  
Old 11-28-2003, 09:48 AM
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Join Date: Mar 2000
Location: Gainesville FL
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The offset keys are designed to compensate for wear on the gears and stretch of the chain. Since you are using all new items there is no need.

The way you would know need, would be to do the measurements. The only special tool needed is a dial indicator to measure valve lift as all Cam indexing is done relative to a certain amount of cam lift. The balancer has the degree wheel.
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Steve Brotherton
Continental Imports
Gainesville FL
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  #3  
Old 11-28-2003, 02:20 PM
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Join Date: Apr 2000
Location: Falls Church, VA
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When I put mine back together with a new chain, the passenger side mark was off a bit until I put the tensioner back in. This has happened to others as well.
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Chuck Taylor
Falls Church VA
'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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  #4  
Old 11-28-2003, 02:49 PM
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Join Date: Nov 2003
Location: MD
Posts: 102
Thanks for the above! Is there a timing cover gasket that can be bought or do I just use gasket maker. I already have o-rings for the h2o holes. Also, the fan clutch looks ok and does not have bearing play. should I replace it anyway? The oil pump feels ok too: the oil pick-up is still pliable and no bearing play. Just don't want to waste $. les
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  #5  
Old 11-28-2003, 04:43 PM
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Join Date: Mar 2000
Location: Gainesville FL
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No gasket, but we use one of the pliable metal to metal sealants.
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Continental Imports
Gainesville FL
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33 years MB technician
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  #6  
Old 11-28-2003, 05:31 PM
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Join Date: Nov 2003
Location: MD
Posts: 102
Hmmm. That seems to be what I thought. l am also not planing on putting the air inj pump back on. What sz is the ck valve fitting that screws into the t-cover side so I can fit the hole? les
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