When to change timing chain

ONLY for ADVANCED technical discussion about the 240sx!
User avatar
Peabody
Posts: 279
Joined: Wed Oct 01, 2003 1:37 pm
Car: 67 Pontiac GTO and coming soon 91 Z32 TT

Post

Hello I am the original owner of a 90 with about 150,000 miles on the car. I have not abused the car that much. A couple of races now and then. Drive it everyday not that hard but like to get on it when I get the urge. At how many miles should the timing chain be changed at. The car runs great and I have no problems. Does it give any signs that the chain is in need of changing? Also, I have back problems and will have to pay somebody to do the job. How much should I expect to pay. Is it a hard job?THANKS, Peabody


User avatar
BadMojo
Posts: 3946
Joined: Sat Feb 22, 2003 2:17 pm
Car: 2007 Mazdaspeed 3

Post

Just my opinion, but if the car is running well and you don't hear any strange noises from the top/front of the engine (a hollow metallic tapping sound), then I wouldn't worry about the chain. Technically, it's supposed to last the life of the engine.

I think the chances of your chain snapping without warning are slim. If you hear any weird noises from the front of the engine or the front of the valve cover, then you want to start thinking about timing chain/guides/tensioner replacement ASAP. You would hear the noise at start-up and at idle.

maik21
Posts: 952
Joined: Sun Feb 08, 2004 10:09 am
Car: 90 Nissan 240SX Coupe 5.0

Post

BadMojo : "If you hear any weird noises from the front of the engine or the front of the valve cover"

i hear this sound when i start the engine... when i replace the oil.. the sound gone. and come back at 2-3 weeks ...

advice you to me to replace timing chain/guides/tensioner ?what happend if i dont replace it?

gyfer
Posts: 395
Joined: Mon Oct 14, 2002 7:30 pm

Post

Peobody,Timing chain in 240sx is design to last a lifetime. But the guides/tensioner wasn't. Quite a few people reported tensioner lose its tension after time (clog with dirt, etc etc) Resulted loose timing chain. Loose timing chain cause wear out, and snap eventually after some time.

The best way to make sure your timinig chain is still in good shape, is to remove your valve cover and visual inspection on your timing chain. It not hard for you to do, and don't take long time. Remember to turn your crank , in order to check the rest of the chain.

gyfer
Posts: 395
Joined: Mon Oct 14, 2002 7:30 pm

Post

Oh ya, on my 90 s13, to replace timing change you need to:

1.remove oil pan.2. remove valve cover3. remove mechanical fan.4. remove steering drive belt.5. remove a/c compressor belt.6. remove alternator belt7. remove crankshaft pulley8. remove oil pump9. remove ignition distributor10. remove timing chain and sprocket, including tensioner and guides.

Althought is not too difficult, is not fun Since is a tedious process, i replaced every belt, tensioner and guides, including oil pump This should last me another 5 years :D

User avatar
BadMojo
Posts: 3946
Joined: Sat Feb 22, 2003 2:17 pm
Car: 2007 Mazdaspeed 3

Post

You have to drop the oil pan in order to get the lower timing chain cover on a KA24DE. In order to drop the pan, you have to either lift the engine or drop the crossmember. Wheeeeeee...fun! I know what I'm probably doing this spring. :|

gyfer
Posts: 395
Joined: Mon Oct 14, 2002 7:30 pm

Post

Lift your engine 2-4 inch up, with a jack stand, will give you enough space to remove your oil pan. It will be better if remove cross member, but I did it without removing it.

cheers.

APCdude
Posts: 96
Joined: Wed Mar 03, 2004 11:39 am

Post

Sorry if I am a bit naive, but what crossmember are you talking about?I have to open up the timing chain to inspect it soon and need to know the best and easiest way to do so.

gyfer
Posts: 395
Joined: Mon Oct 14, 2002 7:30 pm

Post

there is no easy way.Both is hard, you just have the option remove or not remove the cross member.

I am pretty sure the cross member is the other engine mount holding your engine.

:)


Return to “240SX Technical Forum”