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Discussion summary
YOUR RESEARCHChain tensioner replacement
Leading reported evidence
Use 7mm allen wrench
Performed · outcome unconfirmed
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0
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0
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1
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Performed · outcome unconfirmed
I used a 7mm allen wrench to insert thru the teardrop into the timing cover and it worked perfectly to hold the engine at TDC.
Leading evidence: 'Use 7mm allen wrench' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace chain tensioners' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
I have been looking around to see if I could find a proper writeup on changing the chain tensioners on the 996.
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I have been looking around to see if I could find a proper writeup on changing the chain tensioners on the 996. Some say you should lock the cams and the crank at TDC. Other say just lock he crank in TDC and change one tensioner at a time. What is the correct procedure for this? Also as a side question, which way does the M96 rotate when looking at it from behind the car. I think it should be clockwise.
I've done this procedure on a 3.4 (5-chain) engine by just locking the crank at TDC and changing one tensioner at a time. I did not lock the cams. My understanding is that on the 3.6 (3-chain) engines it may be more critical to lock the cams because the chains are longer and it's easier for something to jump time when tension is removed.
2 of them are extremely easy (IMS chain and driver-side bank). The one on the passenger-side bank is extremely not-easy since it's situated behind some accessories that make it very hard to access.
The engine rotates clockwise when looking from behind. If you're not 100% sure just open the engine cover while it's idling and have a look!
ok cool. Mine is a 99 so its a 5 chain engine. Which hole on the crank pulley is the TDC locking hole? also what is the torque spec for putting the chain tensioners back in?
I just did this the other day in my 99 C2. If you are standing behind the car, the engine rotates clockwise. The teardrop hole in the crank pulley is about 10-11 o-clock when the timing mark is getting close. Look at the timing cover at about 1 o-clock for the timing marks, and it will line up with a mark on the back lip of the crank pulley. I used a 7mm allen wrench to insert thru the teardrop into the timing cover and it worked perfectly to hold the engine at TDC. I swapped both of the easily accessible tensioners (IMS and cyl 1-3) this time. I'll do 4-6 at another time.
Just to be safe, once the tensioners are swapped, pull the allen wrench out and rotate the engine clockwise 2x by hand just to make sure the timing marks still match up.
Remove the 3bolts holding the ac compressor and lift it out of the way. Then its on top of the motor but there r some electrical wires that must be pushed out of the way.
