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no no...
ok there are actually 3 timing chain guides...
#1 between the cams, remove
#2 to the right, under the front timing cover, remove
#3 NEEDED - on the bottom of the engine, opposite the chain tensioner arm (helps with the tensioning)
if you are trying to replace #3, you might as well do the full timing chain job.
iirc the timing chain guide has two tensioners. one is on the top left next to #2 guide and one is on the bottom opposite #3 guide. to be honest i'm not really versed in this but i recall reading that its oil pressure sensitive, meaning if you have low oil pressure you could get a slack chain. also the top tensioner can freeze up from gunk if the previous owners didnt change the oil regularly, so clean that off if it looks frozen. before you do anything, check your oil... are you leaking? could be as simple as filling her up.
240sx.org has some more info on it in FAQs. in there you can find info on pricing for kits / buying components seperately. in my experience everythingnissan.com typically has good prices on OEM parts.
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