Have you checked the timing to see if it is correct as things stand
Quote Originally Posted by jayceb The cam markers were not lined up which suggests the timing was out but why Do you mean on the cam pulleys As these mean nothing. Timing has to be checked with the pins inserted into the cams (and flywheel). Quote Originally Posted by jayceb Any how when the rockers break do you need to replace the posts or just the rocker arms I would suggest lifters are not necessary
The list Quote James E...... - 2007 Z06 - built JAN 07 - ______ 3450 (one rocker starting to fail engine built 1707) KGjevre...... - 2007 Z06 - built JAN 07 - intake 3797 (cyl 7 & 8 stock 1st oil change engine built 12207) jan eric..... - 2007 Z06 - built JAN 07 - ______ ____ tigerwho..... - 2007 Z06 - built JAN 07 - ______ 4800 (all rockers with excessive play) Pistol Champ. - 2007 Z06 - built
The beginning (from 61307) httpforums.corvetteforum.comshow...28&postcount1 Quote Originally Posted by Ken Fichtner SERVICE - CHEVROLET DEALERS Subject rocker Arm Concern Diagnosis on 2007 Z06 Corvette Models 2007 Corvette Z06 This message applies to 2007 Z06 models only -- equipped with the LS7 engine. If your dealership encounters a 2007 model Z06 Corvette with a rocker arm concern such as needle
My info 1. car build month January 2007 2. how many and intake or exhaust rocker arm failure 2 both were the (offset) intake rocker arms 3. stock or modded enginesoftware stock 4. mileage when it was discovered 3797 5. current milage (and no further problem) car still at dealer wating for a part - will be 3 weeks total on Friday... 6. cylinder (leftdrivers side front to back 1-3-5-7 right side
Quote Originally Posted by LGR Remember a broken rocker arm bearing will eventually cause a broken valve spring How does that happen I think it is a speculation as I for one could see that happen if the broken end cap parts or needle bearings got into the spring but then on the other hand it is possible that I may have put on anywhere from just a few miles to all of the cars almost 4K miles (maybe
Hey chris I have the same problem in my car broke to rocker arms i think it was caused by over reving it shouldnt of be because of your valve clearance adjustment as this wouldnt increase the the load on it or anything i think they must have casting faults or something. It is in my friends car and we need help in this area. How do u get the long shaft that holds all the rockers out it like has a thread
bump this sucker back up.... i need a hand as i said in the post bout how do ya get the rocker arms out of the head of my car i cant get that long shaft which they all pivot-on out please help a man out i was wanting to put my new rockers in this weekend
Sorry its been a while but its taken me some time to get everything back together and considered road worthy. The problem as mentioned before was a broken rocker arm. Heres what happened.... The people before me didnt adjust the valves and so it had been running loose for some time. When you run these type of rockers loose they tend to create an odd wear pattern on them (they dont wear in the right
ok thanks for the input guys the rocker arms have been in the car since 07 and have around 5000 miles on em. I spoke with scorpion and they say it was the first version of that rocker arm and was prone to breaking very easily so they suggest i pull all the old rocker arms and replace with the newer versions also upgrade the pushrods to some .80 hardened steel ones. They said that likely what happened
Quote Originally Posted by triumph I have just done head gasket on my sedona crdi 2.9 but have a problem with the tappets they have come out of the rockers. I have pulled them to bits and the spring inside has broken up problem is when I replaced the the rocker shaft and it was opening the valves even though the cam is at the bottom. I have bought new rocker arms and they are still pushing down on
After reading more seized lifters are most likely the cause. PO stated it was down on power and kept running it. Most of the lifters are seized on the left side that caused one (or more) rocker arms to fall off. Unfortunately It must have jammed under the cam I bet that is what broke 3 of the 4 cam retainers. Ill need to replace the head on that side at a minimum.
I also have a 1984 318i. I looked and didnt find anything worthwhile online... but you are aware that this is a pretty time-consuming process even more so if you dont remove the head I would definately purchase a Bentley Manual if you dont already have one and read through the process - because you almost have to disassemble the entire head to remove the rocker-bar to get to the broken arm. Readers
Be CAREFUL when they fall off it could cause a lot more damage.... After reading more that IS what happened to my engine as well but mine was more catastrophic. PO stated it was down on power and kept running it. Most of my lifters are seized on the left side that caused one (or more) rocker arms to fall off. Unfortunately It must have jammed under the cam because 3 of the 4 cam retainers were broken
Yeah when I pulled the lifters out they were both seized. I finally just broke down and ordered the special tool. Luckily when they fell out they didnt do any visible damage to the cam or lobes. I plan on pulling it back apart and replacing all of the lifters in the near future.
Well upon further inspection it seems a timing chain guide broke. That may have caused the chain to jump a tooth because it looks like four exhaust valves are bent. That would explain them not closing and causing the rockers to be loose and thus falling off. Austin is not too happy. He thought he was done with major repairs.
Quote Originally Posted by macbook Well upon further inspection it seems a timing chain guide broke. That may have caused the chain to jump a tooth because it looks like four exhaust valves are bent. That would explain them not closing and causing the rockers to be loose and thus falling off. Austin is not too happy. He thought he was done with major repairs. Thats too bad. Good luck with the repair. Chin up Austin.
Update on progress Replaced exhaust valves on left bank timing chain guides (those pins are a pain) plenum seals (thanks rowdie) fuel injector seals and o-rings a ton of vacuum hoses and other assorted hoses (radiator etc.) Got everything together and started it up today. We just ran it briefly to keep Austins spirits up. Still need the following but cannot find anywhere Fuel line from control pressure
can not soak the lifters that are in the block.. And putting oil on the springs does nothing also. it will shed off and does not stick around when engine is running. Cam lobes can be wiped down in 20 minutes if not broken in correctly. But you would notice a performance issue if that is case. You can take the dist out and using a drill spin the oil pump till pressure is up then try to wiggle the rockers.
Your engine is DOHC...you have no pushrods or rocker arms.
QUOTE (BlackCherry06 Aug 20 2009 0147 PM) Quote Your engine is DOHC...you have no pushrods or rocker arms.[b] Odd. I thought that at first but when I called mazda they had those parts..... Any one have a link to a schematic of the valve train
He&39s right while I don&39t have a schematic to post the cams on a OHC engine (in this case DOHC) sit directly above the valve. Without getting to technical the cam&39s lobe presses directly down on the valve eliminating the need for rocker arms and push rods. There must be something else. Can you describe the noise Will the car run
QUOTE (Sacramento6 Aug 20 2009 0321 PM) Quote He&39s right while I don&39t have a schematic to post the cams on a OHC engine (in this case DOHC) sit directly above the valve. Without getting to technical the cam&39s lobe presses directly down on the valve eliminating the need for rocker arms and push rods. There must be something else. Can you describe the noise Will the car run[b] 1
Not sure what part youre referring to - a rocker arm is in the engine and rocks the valves open and closed during the compression cycle. Are you referring to one of the lower control arms in the rear Bob
Quote Originally Posted by TwoBobsKJ Not sure what part youre referring to - a rocker arm is in the engine and rocks the valves open and closed during the compression cycle. Are you referring to one of the lower control arms in the rear Bob x2 Unless you had the Jeep redlined the whole time you were cutting cookies in the grass. Thats not good for any carJeepTruck.
02 and 03 have had some issues. best to replace the springs on those year models. fairly cheap to do but if the spring breaks it could waste your engine. one of those better safe than sorry issues. I speak from experience. I broke a spring in sept. 2010 39000 miles on motor. I am the orignal owner. It broke idleing at a stop light so I got lucky and didnt trash the piston or block. use the search function this has been beat to death on the forums.
Because of the way wear patterns develop both on the valve seats and cam lobes you keep the parts of the specific port together and dont mix and match. Just replace the broken rocker with a new one and put everything else where it came out of. When I took mine off I took a micrometer to them for my own curiosity and couldnt find a difference so it wouldnt be life or death if you didnt label them. And how the heck did you break a rocker arm
Quote Originally Posted by sky888 how is it running now Its running. I havent taken it off the lift yet so I havent even broken it in. Ive got a nail in the right rear tire to fix tonight and I need to find where the clutch line backet bolts up to but everything else seems good. Ive got lowering springs and urethane bushings to put under it too so Im debating on doing that before I take it out.
Quote Originally Posted by SolsticeRacer Its running. I havent taken it off the lift yet so I havent even broken it in. Ive got a nail in the right rear tire to fix tonight and I need to find where the clutch line backet bolts up to but everything else seems good. Ive got lowering springs and urethane bushings to put under it too so Im debating on doing that before I take it out. im glad everything
Ok well maybe then should I completely disregard touching anything in the valvetrain and live by the if aint broke dont go and fix it rule I will have exhaust but now would intake be a better idea Ive heard 99 or so ones are good if you can get one. If I do would it be better than valve train work and would that throttle body spacer bolt up to it
Quote Originally Posted by BLW BY THANX ... I dont believe this to be a bad batch of rocker arms seeing I have a GM bulletin that dates back to 1997. ... Maybe thankful that its just a rocker arm assembly and not something major. Look at all the LS1 LS2 LS3 LS6 and LS7s out there in Corvettes and buggys and what ever else have these motors they all have the same thin retainer washer in all of them.
Update The Chevrolet dealership I took my car in to today found that the intake valve stem pictured was mushroomed and that about 18 of it was gone so they will have to take the right head off and replace the valve. They are also going to replace all the rocker arms as I had already received approval for this work. What is crazy is that if I had not been allowed to and able to time wise to stop by
jeepjeepster 107K. When the spring broke last April it had 97K on it. BTW here are the pictures of the rocker arm in question rocker1.jpg rocker2.jpg rocker3.jpg It clearly shows the intake rocker (on the right) is upside down. The concave pocket on intake rocker arms should be on the bottom. The only suggestion I have for Jeep is to ammend the Caution statement to include andor lash adjusters valves springs and other components. in the last sentence. The Nose
joeym7 wrote Hi Al Thats not a bad price the chain tensioner thru MB is about three hundred dolarsand if you mean roker arms ( or cam followers ) there about fifty plus dollars eachyour tensioner is different then the later ones380500420560 .Did they say the condition of the cams and if you should keep an eye on the other rockers.Joeym Joeym7 Yes roker arms is what I meant. I should have added the
Make sure you buy the right cam and cam towers - the non turbo has a lower lift cam and different cam towers. If you are replacing the cam you are meant to replace the rocker arms as well. For my non-turbo OM617 a new camshaft was about 130 euros at the dealer - the rocker arms were way way more expensive. I think they were something like 75 euros a piece - and you need ten of them Febi rocker arms
diesels and I need the non-turbo assembly. when I was pulling things apart I did find that the top valve adjusting nut on the front most valve was loose and I could turn it by hand easily. All of the other nuts were tight. I am not sure if this became loose as a result of this catastrophe or if it could have caused the problem. My plan still at this time is to just get a camshaft and towers and rocker