[Main C900 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Re: Noise at valve cover at firewall end? Can anyone i.d. Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Wed, 20 Nov 2002 15:33:21 In Reply to: Noise at valve cover at firewall end? Can anyone i.d., cal, Wed, 20 Nov 2002 14:17:06 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

That is the end of the engine with the timing chain. It's also the end of the engine that tends to get the least oil flow to the hydraulic lifters.

As pursang says, it might be a timing chain issue. The chain isn't broken, but it could be loose, or may have even slipped a tooth, causing incorrect valve opening. If the noise isn't going away when warm, I would ASAP pull the valve cover and inspect the chain. Turn the engine to TDC for cylinder #1, and check how the alignment marks on the cams line up with those on the head. The Bentley manual has a nice picture on this. This will show if a cam slipped a tooth, or if the chain is loose. If the chain is loose, it may be a faulty chain tensioner or a worn chain. Inspect the chain and cams for wear. Yes, a worn chain can make a lot of noise, and can be a precursor for chain breakage, which is catastrophic in this engine.

However, never diagnose a worn chain on noise alone. Inspect first. The chain may be fine. Inspect the chain guide in on the underside of the valve cover.

You might also have a stuck valve or lazy valve lifter. This can make a surprising amount of noise. Change the oil if the oil change interval is nearing. It also wouldn't hurt to stick an oil pressure gauge on the engine - just remove the oil pressure sender next to the oil filter and insert a calibrated gauge. Low oil pressure can show up as top-end noise. But a leaky/lazy lifter can make noise. It can also be a problem with the oil distribution lines to the lifters on that part of the head.

Good luck!

posted by 192.249....

• Noise at valve cover at firewall end? Can anyone i.d., cal, Wed, 20 Nov 2002 14:17:06
  • 99 percent of the time it is the timing chain tensioner, JonnyH, Fri, 22 Nov 2002 14:55:11
  • Answer may be very VERY simple, Chaz, Thu, 21 Nov 2002 05:28:41
    • nice idea, but wrong engine>>, burlyb, Thu, 21 Nov 2002 10:25:51
      • What do post 87's use then?, Chaz, Sat, 23 Nov 2002 12:24:47
  • Re: Noise at valve cover at firewall end? Can anyone i.d., raab900, Wed, 20 Nov 2002 15:41:43
    • Re: Noise at valve cover at firewall end? Can anyone i.d., lms, Wed, 20 Nov 2002 15:47:56
  • Re: Noise at valve cover at firewall end? Can anyone i.d., Ari , Wed, 20 Nov 2002 15:33:21 <-- Viewing This Message
  • Re: Noise at valve cover at firewall end? Can anyone i.d., pursang, Wed, 20 Nov 2002 14:27:51

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