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02-02-2008
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#1 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Question about Chain Rattle
I have the usual minor timing chain rattle on cold start up and shut down, nothing major. I've played with oil filters and have found that the Bosch seems to do the best job minimizing it.
My question is this, if I change out the chain tensioners will the rattle go way? You would think it would. But does it at least temporarily (10K miles) solve the problem? Hans 
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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02-02-2008
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#2 |
Join Date: Dec 2007
Location: Reston, Virginia
Posts: 939
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Re: Question about Chain Rattle
Although I only owned my ZR-1 for about month and a half I have been trying to be a quick study... so like you I heard this rattle...asked lots of questions, read up on it and when I had a ZR-1 gathering over my house of course the subject came up... and I listened to the other ZRs... Chain rattle at start up and shut just comes with the LT5...just one the noises it makes, but when I changed all the engine fluids I installed the Bosch filter and the Amsoil AMO oil...that reduced considerably the chain rattle noise. So the noise is one of the special little auditory gifts from Lotus via the LT5
 Michael |
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02-02-2008
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#3 |
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Join Date: Mar 2006
Location: Portsmouth, VA
Posts: 245
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Re: Question about Chain Rattle
Of note, I used to experience zero chain rattle until I switched to a PureONE filter and Castrol SynTech 5w30. I think the filter has more to do with it than the oil. I was using the Mobil1 filter with the zinc fortified Mobil1 oil until I couldn't find it any longer.
No great shakes, just the way it is with these motors. |
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02-02-2008
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#4 | |
Join Date: Apr 2006
Location: Ideho
Posts: 2,653
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Re: Question about Chain Rattle
Quote:
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[I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I] |
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02-02-2008
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#5 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Question about Chain Rattle
there have been reports of the replacement chain tensioners failing. FYI
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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02-02-2008
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#6 | |
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Join Date: Oct 2007
Location: lone pine and mammoth lakes ca.
Posts: 544
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Re: Question about Chain Rattle
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02-03-2008
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#7 |
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Join Date: Aug 2005
Location: San Fernando Valley, CA.
Posts: 896
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Re: Question about Chain Rattle
Fortunately havent had that issue with mine. Always used Mobil 1 filters, dont know if that has anything to do with it or not.
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1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj. |
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02-03-2008
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#8 | |
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Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Question about Chain Rattle
Quote:
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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02-03-2008
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#9 |
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: Question about Chain Rattle
I think.....that's not good this early in the AM....that the core of the issue is on the 2 bolt motors(?) the right side guides were made without a resevior for the oil to lay in after shut down. Therefore upon cold start up the lack of lube at the contact point caused some noise. I don't remember if the noise actually means that the chain is wearing for that short period of time...to the detrement of the chain. Later a new guide was devised with a well for retaining oil after shut down to quiet the following start up. Customer complaints drove this developement....I believe, rather than any actual potiential failure issues.
If I'm correct, there might even be a TSB about the issue over at the mothership site. I noticed with my car that the noise took till after 15k miles to really make itself a regular thing. I got the car with 7400 on it and it only rattled if it sat more than a week. Now, at 29,xxx, it rattles everytime I start it after sitting for more than a coupla of hours...it was an attention getter the first few times for me also.  I do believe that the guide is one of the last places to get oil....so as it wears I suppose the noise gets worse? I guess I'll find out aas time goes by because I'm not gonna stop using my car. I had thought about buying the newer guide but always found different places to spend the budget. Now I think that they are NLA....not really sure about that..I just kind of thought I had seen that somewhere? Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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02-03-2008
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#10 |
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Join Date: Dec 2007
Location: Reston, Virginia
Posts: 939
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Re: Question about Chain Rattle
I should clarify something... this 'rattle' ONLY occurs right a start up and shut down...not continuous nor during running.. With the new oil & filter it is now bearly noticeable which means (1) my initial shock at hearing is now a non- shock routine (2) due to being driven more the rattle is lessening or (3) I am going deaf
 Michael |
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