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01-06-2019
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#1 |
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Join Date: Feb 2018
Location: Poland
Posts: 58
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Timing chain guide
Hello guys,
A few days ago I removed camshaft cover and saw this :  This is number PN10122172 in Jerry's gaskets :  Anybody know is it possible to change this timing chain guide without removing the engine? Last edited by tommy; 01-06-2019 at 05:25 PM. |
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01-06-2019
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#2 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: timing chain
You are referring to the guide not the chain correct?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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01-06-2019
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#3 | |
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Join Date: Feb 2018
Location: Poland
Posts: 58
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Re: timing chain
Quote:
Last edited by tommy; 01-06-2019 at 05:26 PM. |
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01-06-2019
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#4 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: timing chain
Looking at the pictures I am guessing you will need to have the motor out, but I don’t honestly know.. hopefully Pete, Marc or someone that has done something with the guides will chime in
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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01-06-2019
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#5 | |
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Join Date: Feb 2018
Location: Poland
Posts: 58
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Re: timing chain
Quote:
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01-06-2019
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#6 |
  
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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timing chain
__________________
Left Clickable links  -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 01-06-2019 at 06:17 PM. |
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01-06-2019
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#7 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: timing chain
Sorry to tell you the engine will have to come out. While not impossible to do in the car the effort involved is such that removing the engine is actually easier. It will require retiming the cams. To my knowledge Marc Haibeck tried to time cams in the car and found it problematic.
H 
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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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01-07-2019
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#8 |
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Join Date: Feb 2018
Location: Poland
Posts: 58
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Re: Timing chain guide
Thank you for this sad news, so i must try to go out with the engine
 Wysłane z mojego VTR-L29 przy użyciu Tapatalka |
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01-07-2019
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#9 | |
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Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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timing chain
Quote:
How many miles on that engine? Actually it is good news as you caught it before serious damage  What got you to remove Cam Covers (engine installed)? That alone is not so easy but I have done that and have even removed Heads Engine in car but like Hans suggests....You cannot really do a good job timing the engine without engine removal. Chance to do some serious reconditioning possibly replace all 4/6 chain guide facings (two on cam covers). I have no idea what would cause a chain guide facing to break off but it happens (rarely) and I think Jerry of Jerry's Gaskets has insight as to why that might happen (Marc Haibeck I am sure has seen it before and would also have insight). There are two issues (chain guide facings breaking and chain guide facings wearing). It is the inspection of the Chain Guide Facings that is difficult and some inspection of the chain guides is possible through the passenger side oil cap. Marc has also addressed the Chain Guide Facing Inspection issue on his web site. I have been trying to figure out the longevity of chain guide facings but seems to have considerable variation possibly depending on type of engine oil used, environmental temperatures, and other variables (maybe firing up the enigine in sub zero temperatures would contribute to chain guide facings breaking). A figure of 150,000 miles has been mentioned but then I recall there are 200,000+ mile LT5s with original chain guide facings  Marc Haibeck and Jerry are two individuals (and others that have dismantled high mileage engines) that would definitely have the experience to expand on that issue of chain guide longevity
__________________
Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 01-07-2019 at 03:46 PM. |
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01-07-2019
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#10 |
Join Date: Apr 2007
Location: Northern VA
Posts: 2,661
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Re: Timing chain guide
As plastic chain facings age they tend to become brittle and break a lot easier. Recommend also inspecting the cam chain tensioners to make sure they are functioning correctly.
Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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