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617 timing chain tensioner spring replacemt
I am about to replace the tensioner spring as a matter of principal on my '84 300TDT. It has about 266K on it and by using the Cam alighnment marks the timing chain shows 2.5* BTDC..
Having never had the tensioner apart, and not really wanting to take more apart than necessary, can I pull the spring out and replace it, with out removing the Valve cover again? Or does the tensioner/ratchet/spring all need to come out and reassembled outside the block, and then reinstalled?
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46 WDX Power Wagon 84 300TDT daily driver |
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Best regards to my old 240D. Meanwhile are you talkin about the rail or actual hydraulic tensioner on the 617 located under/behind thermostat housing? Am not aware tensioners were rebuildable. And at 2.5* stretch with 266k its safe to assume somebody's already replaced the tensioner when they did the chain. If throwing in new spring "rebuilds" the tensioner thats news to me. My understanding it hydraulic tensioner operates off oil pressure delivered through oil gallery flow direct from oil pump. And the spring does little more than prevent tensioner piston from sticking with valve partially closed. Otherwise ye never need to pull the valve cover to access the chain tensioner.
Last edited by 300SDog; 11-07-2007 at 12:36 PM. |
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It is still here at the ranch.. and i have yet to get it done... although it might happen some day soon, at least it has not gone to the scrapyard!!! there are still some rust issues to attend, like the whole passenger side seam that runs between the floorpan and lower door jam.. as well as some heater/wiper issues.. I think I got the rear end fixed, and figure I will run the engine as it is for a while... (I plan to set the idle up a bit and it doesnt make much noise)
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46 WDX Power Wagon 84 300TDT daily driver |
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46 WDX Power Wagon 84 300TDT daily driver |
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Uhhh just replace the chain also while you are at it
That would be due in another two years, but if you have all that stuff off and the enthusiasm and time, do it now. Never put it off.
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