One of the preventative maintenance procedures I’d like to do is replace tensioner and all (4) guide rails for the m42 timing chain.
At 136K miles – I feel the chain and sprockets themselves will be good for just under another 100K. (sprocket teeth appear very solid currently)
While I have yet to read about a specific story yet – I have heard rumor of decaying (rubber/plastic) chain guide rails disintegrating and leading to catastrophic engine failure. I also believe that proactively replacing guide rails will help chain/sprockets to live a longer life.
That said – my question regards the replacement procedure itself. I don’t want to disturb timing alignment. Chain and sprockets will be left in place.
When swapping the guides out/in, are there any measures that need to be taken to ensure proper timing alignment? Is alignment setting at risk when removing slack from chain? (tensioner/tensioner guide removed)
Is a cam position lock tool needed?
So far, I’ve generated a parts order list including: 4 chain guides, gasket sets for upper/lower timing case, front main seal, circlip for fastening w/ tentioner guide, tensioner, and tensioner gasket. Anything else to get ‘while-I’m-in-there’?
timin chain case and timing chain pages from realOEM for reference..
Thanks for any guidance or input.
At 136K miles – I feel the chain and sprockets themselves will be good for just under another 100K. (sprocket teeth appear very solid currently)
While I have yet to read about a specific story yet – I have heard rumor of decaying (rubber/plastic) chain guide rails disintegrating and leading to catastrophic engine failure. I also believe that proactively replacing guide rails will help chain/sprockets to live a longer life.
That said – my question regards the replacement procedure itself. I don’t want to disturb timing alignment. Chain and sprockets will be left in place.
When swapping the guides out/in, are there any measures that need to be taken to ensure proper timing alignment? Is alignment setting at risk when removing slack from chain? (tensioner/tensioner guide removed)
Is a cam position lock tool needed?
So far, I’ve generated a parts order list including: 4 chain guides, gasket sets for upper/lower timing case, front main seal, circlip for fastening w/ tentioner guide, tensioner, and tensioner gasket. Anything else to get ‘while-I’m-in-there’?
timin chain case and timing chain pages from realOEM for reference..
Thanks for any guidance or input.
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