hey grumpy, started new engine and bent two pushrods?



hey grumpy, started new engine and bent two pushrods?

Postby grumpyvette » April 10th, 2011, 8:32 pm

I got an EMAIL saying one of the guys tried to start his engine after a cam upgrade and installing new cylinder heads and he instantly bent a couple push rods, well thats hardly a rare experience for new engine modifiers, and experience is a good teacher,
EXAMPLE OF BUSTED PUSH RODS
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be very sure you check all the valve train clearances, having a rocker bind on a rocker stud can easily result in busted rockers or studs or bent pushrods
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it should be obvious that the slot clearance in some rockers , especially with poly locks significantly limits rocker movement before clearances become an issue
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BEEHIVE SPRINGS and FORGED STEEL ROCKERS GIVE A GOOD DEAL MORE ROCKER TO RETAINER CLEARANCE
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IT takes hundreds of pounds of force to snap push rods, somethings binding or hitting someplace whether you want to admit it or not, step back and find out whats wrong!
theres a dozen potential sources for clearance issues so check out the links and verify the valve train clearances and geometry
you could have adjusted the valves to tightly, installed the cam several degrees out of its intended index so its hitting the piston, or a few dozen other mistakes.

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if you didn,t verify the cam timing with a degree wheel , you failed to adjust the valve preload, or lash,and you failed to check clearances, like rocker arm slot to rocker stud and push rod to guide plate or push rod to cylinder head during the whole 720 degree valve train cycle, and clearances like piston to valve and spring bind and retainer to valve guide your going to have issues in most cases, its best to assume you did EVERYTHING WRONG until you verify ALL the potential clearance and geometry issues
your in miss. so your not local, but it won,t take long to isolate the cause if you do it check the potential sources, just assume everything needs to be verified before proceeding

viewtopic.php?f=52&t=181

viewtopic.php?f=52&t=90

viewtopic.php?f=52&t=399

youll need to back off all the push rods until they are a bit loose on the cams base circle

read these links
viewtopic.php?f=52&t=196

viewtopic.php?f=52&t=126&p=1193&hilit=louis#p1193

http://www.crustyquinns.com/tech/easyout.html

hey its part of the learning curve! theres no experienced hot rodder that has not screwed up several times, just learn, move on and youll be fine, its just one of the ways experience has of making you remember not to do things wrong, like the first time you touch a finger to a stove burner when your 3-4 years old, you learn that was less than the ideal route to go and from then on you do things differently

when you run into problems with busting push-rods step one is always the same!
STOP and figure out all the clearance and geometry and cam index issues BEFORE proceeding
READ THE LINKS PROVIDED and assume you did EVERY LAST THING WRONG until you VERIFY its CORRECT!
YES IM aware some of you would rather pluck your eyes out with a red hot fork than read links, but if you want to find the problem , and theres OBVIOUSLY A PROBLEM, its a simple check list, measure verify and then proceed ONLY after checking and not ASSUMING you did things correctly

viewtopic.php?f=52&t=181

viewtopic.php?f=52&t=90

viewtopic.php?f=52&t=399

viewtopic.php?f=52&t=2746&p=7144#p7144

viewtopic.php?f=52&t=196
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: hey grumpy, started new engine and bent two pushrods?

Postby grumpyvette » April 20th, 2011, 11:32 am

read thru the links , if you read thru, understand the issues and do the required checks and clearance work it will prevent a great deal of problems

YES IM only too well aware that a few guys would rather be boiled in hot oil that read links....or work from the experience of others, thats a bit like repeatedly sticking your fingers on a red hot stove burner too repeatedly verify you'll get burnt!



viewtopic.php?f=52&t=181

viewtopic.php?f=52&t=90

viewtopic.php?f=52&t=5931

viewtopic.php?f=52&t=399

viewtopic.php?f=52&t=2746&p=7144#p7144

viewtopic.php?f=52&t=196
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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