[300CUL8R]

That's the current diagnosis. How did it happen? Don't know. Did it damage anything else? Don't know. How long to fix? Ditto

Anyone have some feedback. There are some big guns working on the car as I type this so hopefully we're looking at some sort of resolution soon.

DCX HQ, the regional Factory Rep, and the District Service manager are all involved. The Executive office has been great and truly seems to want to get this resolved.....quickly.

13 days in the shop and counting.

 

[marlinspike]

You sure you didn't overrev that thar engine? I forget what you said was going on when it first died. Perhaps a fualty tach or something?

 

[300CUL8R]

How?

Can you over rev an automatic?

 

[arnoldw]

Valve stem to guide clearance may be a little tight. Was it the exhaust? I believe those are sodium cooled stems.

 

[II kings 9:20]

Can't over rev, that's what the limiter is for and in manual mode it shifts before redline.

 

[JMatt]

Can't over rev, that's what the limiter is for and in manual mode it shifts before redline.

Wrong. Mine has allowed a downshift that caused an over rev TWICE. Once today. I have no idea why it allowed this.

 

[HEMEEE]

Here's your feedback...

If this were happening to me it would be more than a pushrod that was BENT!

My offer to buy you a beer at the SoCal Meet stands!!
Are we there yet??

Best of luck

 

[Redman]

Cant be

Wrong. Mine has allowed a downshift that caused an over rev TWICE. Once today. I have no idea why it allowed this.

The plot thickens....

 

[300CUL8R]

No beer...

unless my SRT is back then I'll get a round.

 

[goddardzilla]

Common things in a pushrod engine that cause them to bend

1. Due to tight tolerances valve siezes in the guide, in the closed or near closed position, the cam tries to open the valve, the rocker arm contacts the siezed valve something has to give and the pushrod is it.

2. Engine is overrevved, valve spring can no longer control valve, valve touches piston, valve bends, jams in guide, the cam tries etc. etc. pushrod bends

3. Less common more unlikely, but still possible, rocker arm siezed on the rocker shaft, cam pushes pushrod against it, pushrod bends because rocker arm will not move.

see my post #20 in this thread
http://www.300cforums.com/forums/showthread.php?t=6234&page=2&pp=10

Zilla

 

[stang]

Sounds like the srt boys at DCX, might have to do some fine tuning or re-engineeering, on their new creation!! One of the few draw backs of a first year "highly modified" new engine!! Maybe they should of went with a proven one --the V-10 SRT!! Wow,that sounds real cool!!! Hmmmm-Let's see,a 300c SRT-10---YEP,I definitely like the sound of that!!!!

 

[jhelmuth]

Common things in a pushrod engine that cause them to bend

1. Due to tight tolerances valve siezes in the guide, in the closed or near closed position, the cam tries to open the valve, the rocker arm contacts the siezed valve something has to give and the pushrod is it.

2. Engine is overrevved, valve spring can no longer control valve, valve touches piston, valve bends, jams in guide, the cam tries etc. etc. pushrod bends

3. Less common more unlikely, but still possible, rocker arm siezed on the rocker shaft, cam pushes pushrod against it, pushrod bends because rocker arm will not move.

see my post #20 in this thread
http://www.300cforums.com/forums/showthread.php?t=6234&page=2&pp=10

Zilla

Totally agree with Zilla here. I had expressed my opinion earlier that it was either a blown head gasket or bent valve, and based on the description of the compression test results - it sounded more like a bent valve (albeit blown head gaskets are much more common on new engines).
It's interesting - and disturbing - that a bent pushrod is cited. I'd bet on #2 above. Valve springs may get into an engine assembly that do not meet spec (or are borderline). Reving the engine to the top (or near) will expose the weak valve spring. What is a bit disturbing (to me) is that the root cause is not being revealed . Even if a pushrod is bent, it does not bind (it would have to be severely bent to possibly bind, and at that point it may lose contact altogether with the lifter and rocker and be totally ineffective) and would not account for a bad compression test (IE - no compression where a valve must open) .
I guess it won't matter in the end as you'll end up with a new engine anyway.

 

[300CUL8R]

New motor....hmmm

I have mixed emotions if they decide to go with an entirely new motor. On one hand I get a new motor that didn't have these issues and probably will not have the same problem. From what I know the new motor would be a drop in crate motor and not need to pull any engine components from the existing one.

On the other hand the service record on the car will have "Motor Replaced" all over it and would most likely affect resale value or ability to sell should I ever sell it.

If they go new motor I WILL need compensation for this other than the 7/100 warranty that I am insisting upon.

 

[Redman]

I have mixed emotions if they decide to go with an entirely new motor. On one hand I get a new motor that didn't have these issues and probably will not have the same problem. From what I know the new motor would be a drop in crate motor and not need to pull any engine components from the existing one.

On the other hand the service record on the car will have "Motor Replaced" all over it and would most likely affect resale value or ability to sell should I ever sell it.

If they go new motor I WILL need compensation for this other than the 7/100 warranty that I am insisting upon.

Dont settle for anything less.
I glad they are taking care of you - but remind them how special this car is supposed to be.
Good luck!

 

[xscash]

its happened here also! 06' awd 5.7 the drivers front cylider has bent an intake pushrod. looks to me that the rockers are held in place by a weak a$$ spring clip and if the clip moves the rocker can slide side to side setting it of center perhaps allowing the rod to be bent. sound logical?? i have found no other damage.
symtoms were;
a constant ticking from the motor

engine not quite as smooth as normal

no loss in power

i have orderd a new complete intake rocker assaembly and 1 pushrod.

 

[stevesrt8]

sad

sorry to hear of your issues.

But as this thread is from 05 it seems to be an uncommon problem!!!

 

[xscash]

well my spring clip theroy is out the window. the new rocker assembly is sold totaly assembled and it has no clips!!! ARGHH all clips are gone, i guess they were not needed. so now i have no idea what would bend this rod. the spring on this valve looks to be in perfect condition, i know in the previous posts there was a broken sping leading to this, but not the case here. i guess ill see what happens with all the new parts.

 

[PerfRacer]

So, what was the indication that your engine has an issue? What made you concerned? How did you approach the dealer about it? I have a very noticable "clicking", or "ticking" that comes in about 5-8 seconds after starting the car (hot, or cold, but worse cold), lasts for about 20 seconds or so, then goes away. It sounds sounds like valvetrain lash, so I'm curious about the details of your situation....

 

[xscash]

well, i didnt approach the dealer as the vehicle is out or warantee, i did the repair myself in [email protected] a cost of $65 for the rod, a new intake rocker assembly complete and all valve cover gaskets. degree of difficulty on a 1-10 was abot a 3. special tools...tourque wrench and sockets. the ticking/clacking was only coming form one side of the motor, audible at almost all rpms but was not all that loud. i couldnt hear it in the drivers seat unless i was at a drive thru. it sounds as if you are down a quart of oil...which i was not but i changed it just to be safe as with the plugs also. that didnt help, so i pulled the cover and started looking around. the bent rod was very noticable, and because of the curve, the rod was slightly shorter allowing the rocker to slap creating the noise.

 

[PerfRacer]

Thanks for the info. So, your noise was all the time, huh? Mine's only after about 5 seconds, after start up, it lasts about 20 seconds, and then goes away. The car runs great, I'm just curious about this noise.. I may step up the grade of oil next change, and see of that does anything. And/or, I may just pull the covers and take a look for myself. Your car's all good after replacing the bent pushrod?