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Pushrod Problems
#979780
04/24/11 08:18 PM
04/24/11 08:18 PM
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Joined: Oct 2007
Posts: 1,031
Raleigh N.C
hemiparts
OP
"Missile Pilot"
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OP
"Missile Pilot"
Joined: Oct 2007
Posts: 1,031
Raleigh N.C
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Went to run the 52nd Easter Bash @ Roxboro today, first pass car comes out of the water clean. Pull into the lights at the hit the car feels like it has no power go to second, no better kill it and let it coast off. Get it back to the pits I have a bent push rod on the #3 cylinder  .What could have caused this ??? Everything else seems fine. Any idea or suggestions as to how to keep this from happeing again?? Thanks as always. Chris
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Re: Pushrod Problems
[Re: hemiparts]
#979781
04/24/11 08:27 PM
04/24/11 08:27 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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First thing I would have checked is the adjuster nut, did it loosen allowing the screw to back out? Second pull the lifter, check the bottom for wear, Hydraulic lifter, check to see if is collapsed. 
it's ok to butt heads, just don't do it with a butthead
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Re: Pushrod Problems
[Re: steeldust]
#979784
04/25/11 12:02 AM
04/25/11 12:02 AM
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Joined: Jan 2003
Posts: 19,609
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,609
Las Vegas
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They usually bend from some sort of interference, assembly issue or adjuster problem. One other issue is just a bad pushrod or not strong enough for the application but that is not something I have seen alot for sure. Either an adjuster backed out etc. An adjustment or assembly problem, meaning the cup was not in the adjuster properly or something hit something, meaning the valve and piston. Generally speaking the pushrod is the weak link here. Take a long close look at the spring, rocker, lifter and valve particulaly the adjuster, may be tell tale signs of the issue. A leak down will probably tell you if you had a valve piston issue...Good luck..
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Pushrod Problems
[Re: Cab_Burge]
#979786
04/25/11 11:54 AM
04/25/11 11:54 AM
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Joined: Oct 2007
Posts: 1,031
Raleigh N.C
hemiparts
OP
"Missile Pilot"
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OP
"Missile Pilot"
Joined: Oct 2007
Posts: 1,031
Raleigh N.C
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Quote:
Quote:
Went to run the 52nd Easter Bash @ Roxboro today, first pass car comes out of the water clean. Pull into the lights at the hit the car feels like it has no power go to second, no better kill it and let it coast off. Get it back to the pits I have a bent push rod on the #3 cylinder .What could have caused this ??? Everything else seems fine. Any idea or suggestions as to how to keep this from happeing again?? Thanks as always.
Chris
How many runs or how long or miles where on the parts when the pushrod failed?
New motor less than 6 passes.
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Re: Pushrod Problems **UPDATE PART2**
[Re: rowin4]
#979792
04/28/11 10:47 PM
04/28/11 10:47 PM
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Joined: Jan 2003
Posts: 19,609
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,609
Las Vegas
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Sorry to hear about the issues. But pushrods dont usually just fail...
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Pushrod Problems **UPDATE PART2**
[Re: chris3]
#979795
05/18/11 10:20 AM
05/18/11 10:20 AM
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Joined: Dec 2009
Posts: 21,206
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,206
in a cattle trailer down by th...
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Wow, torque to yield rod bolts?
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Pushrod Problems **UPDATE PART2**
[Re: chris3]
#979796
05/18/11 10:30 AM
05/18/11 10:30 AM
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Joined: Jan 2003
Posts: 75,326
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,326
A gulag near you.
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Quote:
This is the latest in the broken 340. The ARP bolts in the K1 Technologies connecting rods were in fact tightened properly. All of the bolts in all of the remaining rods were still tight when I removed them.
The bolt were tightened in accordance with the torgue/angle instructions included by K1 Technologies. When I contacted them that was the first thing they said that they were not tight. Two people tightened the bolts with a new Snap On torque/angle torque wrench. I contacted White Performance in Tenn., the place we purchased the rods and bearings. At their request I sent the broken rod to them for checking. K1 continued to insist that the bolts were not tightened. I measured the stretch of the bolts, taken out of the broken rod, rod that had not broken and was still tight and a new unused bolt and verified that the bolts in the broken rod had been tightened. I received a call from White Performance verifying that there shop had confirmed that the bolts in the broken rod had been tightened and still backed out. K1 still will not discuss anything concerning this problem other than the bolts were not tight. I have a motor that has 6 runs on it with a torn up crankshaft, two bent valves and push rods scared block. White Performance has gone to great effort to assist in getting us back running with no consideration from K1 Technologies.
The best you will get from K1 is a new pair of rods, if you are hoping they are going to pony up to fix the rest the engine I wouldn't hold your breath. everyones favorite rotating assembly supplier would and has done the exact same thing, replaced the part that failed and it's your dime for the rest.
Quote:
Wow, torque to yield rod bolts?
With any top end rod bolt that is the preferred method to torque the bolt , but you use a rod bolt stretch gauge not torque to yield.
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Re: Pushrod Problems **UPDATE PART2**
[Re: JohnRR]
#979797
05/18/11 10:44 AM
05/18/11 10:44 AM
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Joined: Dec 2009
Posts: 21,206
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,206
in a cattle trailer down by th...
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Quote:
Quote:
Wow, torque to yield rod bolts?
With any top end rod bolt that is the preferred method to torque the bolt , but you use a rod bolt stretch gauge not torque to yield.
Yeah I get the stretch part, not the angle gauge part, I've never seen that on a rod bolt, seems like a stupid idea as I never thought that was a very accurate way of tightening a bolt.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Pushrod Problems **UPDATE PART2**
[Re: Guitar Jones]
#979798
05/18/11 10:49 AM
05/18/11 10:49 AM
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Joined: Feb 2007
Posts: 5,080
organ
maximum entropy
master
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master
Joined: Feb 2007
Posts: 5,080
organ
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Quote:
Quote:
Quote:
Wow, torque to yield rod bolts?
With any top end rod bolt that is the preferred method to torque the bolt , but you use a rod bolt stretch gauge not torque to yield.
Yeah I get the stretch part, not the angle gauge part, I've never seen that on a rod bolt, seems like a stupid idea as I never thought that was a very accurate way of tightening a bolt.
bolt stretch is by far the best method, and we have access to both ends of the rod bolts, allowing easy measurement. usually the recommended torque is exceeded by a significant amount to properly stretch the bolts. this situation sounds like either a bolt failure (not likely), or a bolt not properly stretched (probable). i also measure main stud and head stud stretch, fwiw.
for what is the good life if not doing things thoughtfully?
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Re: Pushrod Problems **UPDATE PART2**
[Re: Guitar Jones]
#979799
05/18/11 12:09 PM
05/18/11 12:09 PM
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Joined: Nov 2004
Posts: 3,547
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,547
Syracuse,NY
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K1 rods use torque and ANGLE. You use a preset torque spec, then use a angle guage to properly set the stretch. Its a very good system. Rod bolt stretch is still the preferred method, but I have never had an issue with torque and angle method, which I still use for all K1 rods.
I highly doubt this was a rod bolt failure in itself.(meaining a 2000 bolt just simply snapped off) I also highly doubt you'll get anyone involved in the assembly to say they made a mistake.If people are talking stretch, then the machine shop should be able to show you a list of what the before and after measurements were on the fasteners, if they cant, then they didnt use a stretch method.
The only way to truely rule out a catastrophic rod bolt failure ( which I still doubt) would be to send both rod bolts out of that ONE rod to an independant metallurgist for inspection.
Sorry to hear, but all you can do is move forward.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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