Bent Valve Club
#1
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Hi all,
I was looking at John Veninger's sig the other day and it noted that he was a member of the "bent valve club". I started thinking about this since I too am a card carrying member of this "exclusive" club. I figure it might be a good data point if all who are members posted....maybe some trends (outside of improper belt maintenance) can be determined???
So...my question is...
Are you a member of the Bent Valve club?
Yes, twice, once before I bought it and once after I owned it for a couple of years
if so, did you repair it yourself?..hire a shop?
First time PO had shop do it ($8000 worth). Second time I did it with help from friends.
How many bent valves? and which ones
First time all 32 were replaced (don't know if all were bent or not). Second time only two intake valves on number 4.
Which engine succumbed?
32 valve 89GT 5.0 liter
Cause of the bent valves?
First time likely lack of Tbelt maintenance. Second time an improperly rebuilt tensioner without oil caused over tension, subsequent wearing of cam gears that cut into edges of belt and teeth stripped at crank gear on startup.
I was looking at John Veninger's sig the other day and it noted that he was a member of the "bent valve club". I started thinking about this since I too am a card carrying member of this "exclusive" club. I figure it might be a good data point if all who are members posted....maybe some trends (outside of improper belt maintenance) can be determined???
So...my question is...
Are you a member of the Bent Valve club?
Yes, twice, once before I bought it and once after I owned it for a couple of years
if so, did you repair it yourself?..hire a shop?
First time PO had shop do it ($8000 worth). Second time I did it with help from friends.
How many bent valves? and which ones
First time all 32 were replaced (don't know if all were bent or not). Second time only two intake valves on number 4.
Which engine succumbed?
32 valve 89GT 5.0 liter
Cause of the bent valves?
First time likely lack of Tbelt maintenance. Second time an improperly rebuilt tensioner without oil caused over tension, subsequent wearing of cam gears that cut into edges of belt and teeth stripped at crank gear on startup.
Last edited by Tom. M; 02-26-2008 at 04:43 PM.
#3
Nordschleife Master
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Are you a member of the Bent Valve club?
My name is Ryan and i am a member of the bent valve club
if so, did you repair it yourself?..hire a shop?
Did it myself and continued with rebuilding the entire engine
How many bent valves? and which ones
8 total. 2 Intake and 6 exhaust (forget which cylinder's intakes were bent but the 6 exhaust valves were in 3 consecutive cylinders i think 1-3 or 2-4, i forget which.
Which engine succumbed?
90 GT engine with 112K miles on it
Cause of the bent valves?
Belt overheated due to a seized water pump which thankfully caused no damage to the block.
My name is Ryan and i am a member of the bent valve club
if so, did you repair it yourself?..hire a shop?
Did it myself and continued with rebuilding the entire engine
How many bent valves? and which ones
8 total. 2 Intake and 6 exhaust (forget which cylinder's intakes were bent but the 6 exhaust valves were in 3 consecutive cylinders i think 1-3 or 2-4, i forget which.
Which engine succumbed?
90 GT engine with 112K miles on it
Cause of the bent valves?
Belt overheated due to a seized water pump which thankfully caused no damage to the block.
#4
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Are you a member of the Bent Valve club?
Yes![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
if so, did you repair it yourself?..hire a shop?
Yes, but heads were sent out. Some valves were so bent they needed to be cut out!
How many bent valves? and which ones
ALL 32 and cracked 4 valve guides
Which engine succumbed?
32V Stroker with only 4 track days on it!
Cause of the bent valves?
Water pump pulley fell off
Yes
![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
if so, did you repair it yourself?..hire a shop?
Yes, but heads were sent out. Some valves were so bent they needed to be cut out!
How many bent valves? and which ones
ALL 32 and cracked 4 valve guides
Which engine succumbed?
32V Stroker with only 4 track days on it!
Cause of the bent valves?
Water pump pulley fell off
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Last edited by John Veninger; 02-26-2008 at 09:19 PM.
#5
928 Collector
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Are you a member of the Bent Valve club?
Yes, more than once
if so, did you repair it yourself?..hire a shop?
I paid a friend the second time, the first time I paid a shop 10k!
How many bent valves? and which ones
All 16 once, next time only 2 or 3
Which engine succumbed?
BMW 8-valve and GTS
Cause of the bent valves?
Belt failure as result of lack of service. BMW be;t was running in oil. GTS belt was shredded by razor sharp cam gears
Yes, more than once
if so, did you repair it yourself?..hire a shop?
I paid a friend the second time, the first time I paid a shop 10k!
How many bent valves? and which ones
All 16 once, next time only 2 or 3
Which engine succumbed?
BMW 8-valve and GTS
Cause of the bent valves?
Belt failure as result of lack of service. BMW be;t was running in oil. GTS belt was shredded by razor sharp cam gears
#6
928 Engine Re-Re-Rebuild Specialist
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Are you a member of the Bent Valve club?
Yes, I joined on August 24, 2004.
if so, did you repair it yourself?..hire a shop?
Nope. Learned, with help from lots of Rennlist members, to fix it myself. Purchased 2 rebuilt heads, pulled engine and installed them myself.
How many bent valves? and which ones
6, can't remember which ones
Which engine succumbed?
32 valve 85 "S" 5 liter
Cause of the bent valves?
Misaligned belt due to bent tensioner arm shoulder bolt. Belt eroded against timing belt covers to 1/2 its original width, then slipped off one of the cam gears. Uncertain what bent the bolt -- possibly overtightened.
Yes, I joined on August 24, 2004.
if so, did you repair it yourself?..hire a shop?
Nope. Learned, with help from lots of Rennlist members, to fix it myself. Purchased 2 rebuilt heads, pulled engine and installed them myself.
How many bent valves? and which ones
6, can't remember which ones
Which engine succumbed?
32 valve 85 "S" 5 liter
Cause of the bent valves?
Misaligned belt due to bent tensioner arm shoulder bolt. Belt eroded against timing belt covers to 1/2 its original width, then slipped off one of the cam gears. Uncertain what bent the bolt -- possibly overtightened.
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#8
Burning Brakes
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This thread is an omen!
My belt light came on today, I turned around pulled it back in the garage, came in here to the computer and ordered the belt tensioner from Ken...I'm on my way back to the garage to put the car up on stands so I can start tearing into it....
I refuse to join this club without a fight!!
My belt light came on today, I turned around pulled it back in the garage, came in here to the computer and ordered the belt tensioner from Ken...I'm on my way back to the garage to put the car up on stands so I can start tearing into it....
I refuse to join this club without a fight!!
#10
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#12
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Are you a member of the Bent Valve club?
Yes
if so, did you repair it yourself?..hire a shop?
Yes, repaired it myself as well as the valve guides.
How many bent valves? and which ones
2 intake 1 exhaust
Which engine succumbed?
Laverda Jota m/cycle
Cause of the bent valves?
Cam timing chain parted at the master link...............7k kms
Yes
if so, did you repair it yourself?..hire a shop?
Yes, repaired it myself as well as the valve guides.
How many bent valves? and which ones
2 intake 1 exhaust
Which engine succumbed?
Laverda Jota m/cycle
Cause of the bent valves?
Cam timing chain parted at the master link...............7k kms
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#13
Nordschleife Master
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Ryan, Tom, and Malcolm.
I have Ken's tensioner on ALL of my 928s, I will NEVER go back.
IMO this will save the engines, and I have alot of hard miles on a 86 engine, connected to a manual tranny and it has performed flawless.
I have Ken's tensioner on ALL of my 928s, I will NEVER go back.
IMO this will save the engines, and I have alot of hard miles on a 86 engine, connected to a manual tranny and it has performed flawless.
#14
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Colin...........as you know I'm already there with the PKtensioner...............the engine was not a 928 as noted..........it still hurt like hell.