Start Up Rattle - Part Upgrade to Eliminate
Greetings!
My '98 base w/ Tip is going into the shop in a couple of weeks for some maintenance items, and while it's there, I was going to have an update I've read about installed that seems to eliminate the start up rattle issue. I believe the part is updated from the original by the addition of some sort of spring that holds pressure on the tensioners. For some reason, I haven't been able to find it via search. Could someone please let me know what parts I need for this upgrade, and is it truly compatible with my '98? Has anyone done the upgrade and arrived at an acceptable outcome? Thanks! |
Depends upon how deep you want to dive on this one. Startup clatter can be caused by your lifters, hydraulic chain tensioners, chain pad wear, cold start piston slap, bore scoring, or even stretched timing chains.
You need to isolate the source before even thinking about fixing it, as you can throw a lot of part and labor $ at it, and still have the issue if you guess wrong. |
Never heard of an "update to eliminate rattle" Are you talking the engine, front of car, exhaust, what?
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I have the exact same thing happen on my 2002S. I had my Wife start the car while I was laying under it. It's not the exhaust, and it only lasts for about 2 seconds. I also assumed it was probably the tensioners because it reminded me of the same sounds when my oil fed tensioners on my aircooled 3.2 would deflate and make the same chain sound at startup. I was going to start there as well.
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He is talking about the Intermediate shaft to crank chain tensioner with the external spring that Porsche upgraded in 01-02, helps prevent tensioner relaxing/collapsing while sitting. My 98 has one installed should work fine in yours.
Edit This part https://www.pelicanparts.com/More_Info/99610518058.htm?pn=996-105-180-58-M100&SVSVSI=1049&DID=13597 |
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Many don't know that at your Porsche dealer you can purchase either just a filter element or a complete assembly consisting of the plastic container with (obviously) a new relief valve plus of course the filter element. Not a bad thing to do periodically. |
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http://986forum.com/forums/performance-technical-chat/56640-chain-ramp-replacement-gaining-access.html As far as changing the tensioner, some have reported no issues just locking the crank on the 5 chain engine. I do not see any reason that would not be sufficient. However I do not like taking chances and I have the IMSB tools so I also locked the bank 1 cams which JFP recommends. |
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I'm all for updating parts, but with the available evidence this seems a bit sketchy to do. This may be a silly thing to say, but who cares about startup chain rattle? If the ramps are good, your cam deviations are good, and the oil pressures are fine I personally think this is a non-issue. Sent from my POCOPHONE F1 using Tapatalk |
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Attachment 23012 As far as sketchy goes, The changes per the technical bulletin was moving from a roller to a tooth type chain requiring a change to the crank and IMS drive sprockets, these obviously are not interchangeable and the TSB makes sure to address this. The change to the Tensioner was to add an external spring to help during startup. Even though not mentioned in the Technical bulletin there were improvements to the chain paddle. However the point the chain tensioner contacts on the backside of the paddle that has no interaction with the tooth type chain remained the same black plastic pad in the same location. Personally I see this as an mechanical improvement unlike a 1200 cfm square bore .;) |
Monty, are you then saying I can use the external spring version on my '98?
It seems there's an updated tensioner for my specific engine (w/o the external spring), and from what I've read, it's a tad longer than the original, which could be a design change, or perhaps the tensioner that was replaced was "stuck" in a retracted position. Based on some cursor research, it seems that replacing the original tensioner, with the updated version of the original, doesn't seem to address the rattle at start-up issue. I have however read that the external spring version does have an effect. I just want to make sure I don't blow up my 37K mile engine with the wrong part! :D |
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Thanks! Great to hear!!!!
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