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Author Topic:   Bent Connecting Rod
RonnieT
Gearhead

Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99

posted 09-22-2002 01:23 AM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
Yesterday after we cleaning the car up to go to a local show I went to crank it. It turned over what seemed like only 1 or 2 turns and then made a strange noise. I tried to crank it again and it turned over a little then stopped, My first thought was battery, it checked good, so I grabbed a wrench and tried to turn the engine over, locked up tight! So I pulled the plugs and still nothing. broke the engine down and was shocked at what I found.
http://members.cox.net/69mach_1/Connecting%20Rod%201.JPG
http://members.cox.net/69mach_1/Connecting%20Rod%202.JPG
http://members.cox.net/69mach_1/Connecting%20Rod%203.JPG http://members.cox.net/69mach_1/Connecting%20Rod%204.JPG

I did not find any signs of water in the cylinder, or any other reason for the rod to bend. Well I wanted to build a 408 stroker motor, but not this soon.

Well I guess my car will be a garage ornamant till I get the time and money, mainly money, to build another engine. Atleast there is no damage to the block or heads that I can see.

------------------
Ronnie
69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

[This message has been edited by RonnieT (edited 09-22-2002).]

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V8 Thumper
Gearhead

Posts: 4376
From: Arizona
Registered: Dec 2001

posted 09-22-2002 02:27 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
OMG

That sucks I'd be interested to know what happened. Those things don't just fold over like that for the hell of it Is it my monitor, or is that rod blue?

[This message has been edited by V8 Thumper (edited 09-22-2002).]

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mustangs68
Moderator

Posts: 22182
From: Buckroe Beach Va MCA#39406 M&M #12 Member Mustang Club of Tidewater
Registered: May 99

posted 09-22-2002 08:58 AM     Click Here to See the Profile for mustangs68   Click Here to Email mustangs68     Edit/Delete Message   Reply w/Quote
Damn, thats only good for a paper weight now!
sam

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RonnieT
Gearhead

Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99

posted 09-22-2002 10:27 AM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
V8 Thumper,

No it's not your monitor, the top of the rod is blued some. It has been a couple of years since I built my motor, but I seem to remember commenting to my wife how it looked like the shop got the ends of the rods very hot when either removing or installing the wrist pins. This should have threw a flag up to me at the time, but I was ready to get the car going. I have not been back to that shop ever again and will not recommend it to anyone because of the substandard work they did and the time it took them to do it. I am going to look back through my files and see if I had logged the part# on the rods when I broke the engine down. I thought I had C9 rods in the engine, but these are D6OE rods, so I think the shop swapped rods on me also.

I am kinda at a loss as to what happened. Since I found no signs of liquid in the cylinder and I was cranking the engine when it happened it puzzles me. I may see if one of the metallurgist at work can tell what happened, maybe the shop got the rod too hot and changed the heat treatment.

Sam,

I though about using it for a paper weight, but everytime I look at it it makes me sick. It will just have to hang on the wall as a reminder.

------------------
Ronnie
69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

[This message has been edited by RonnieT (edited 09-22-2002).]

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kid vishus
Gearhead

Posts: 6060
From: middle of NC
Registered: Oct 2000

posted 09-22-2002 12:16 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Speaking from personally observing a local shop install press fit pins, that heat doesnt look like it went too fart down the rod. Thats a pretty typical distance for the rod to be discolored, at least from what I have seen. I have a set of cleveland rods that are discolored that far down. I woldnt be afraid of rods that had that amount of heat applied to them.

I would highly doubt that the heating had anything to do with the rod bending. It very well could have hydrauliced that cylinder with fuel, and it evaporated before you got it pulled apart. At least it's a theory.

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n2oMike
Gearhead

Posts: 2395
From: Spencer, WV
Registered: Jan 2001

posted 09-22-2002 03:50 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
It's normal for the top of the rod to turn blue when it's heated for pin installation.

Something else caused that rod to do that! Chances are, the cylinder filled with fuel or water, and the piston didn't have anywhere to go... which caused the rod to bend.

This same thing happened to me once. My heads are ported beyond their safe limits in the bowl area, and a crack formed to the side of the valve guide in the intake port. This allowed water into that cylinder, and when the engine was cranked, the rod bent. The 'now' shortened rod caused the piston to jam against the crank's counterweight... locking the engine up solid.

This just had to happen at the race track, where a lot of friends and family members came to see the car in action... Damn thing wouldn't even back off the tow dolly!

To fix the head, I ended up drilling a hole through the top part of the head between the valve springs so I could JB-Weld the crack on BOTH sides... (after a thorough cleaning and grinding out) After the repair was made, I tapped the hole and installed a pipe plug. I then ground the plug out for spring clearance, and it worked great ever since!

I replaced the piston, rod and the crank (for safe measure) then had it rebalanced... and revved happily ever after.

You need to check for a sunken float (which would allow excessive fuel into the engine) or something leaking water. That engine hydrauliced from something...

I had the block magnefluxed to check it out, but it was fine.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

[This message has been edited by n2oMike (edited 09-22-2002).]

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 09-22-2002 07:03 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
It had to have hydralocked. Perhaps the fluid drained down before you disassembled it. Are these all on just one side?

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Moneymaker
Administrator

Posts: 25539
From: Lyons, IL, USA
Registered: May 99

posted 09-22-2002 07:13 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Do you have an electric fuel pump Ronnie?

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA/MCA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"

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RonnieT
Gearhead

Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99

posted 09-22-2002 11:39 PM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
Been gone all day so lets see if I can answer a few questions.

Brandon,

I'm not trying to flame you, but, please re-read my post and I answered all your questions before you asked them except 1. It was from the #4 cylinder. You need to read better before asking questions.

Kid,

Thanks for the info, If I see things dicolored like that at work we check them out real well before we use them.

Mike,

My first thought was the cylinder filling with fuel or water also, but I pulled the plugs right away and did not find any signs of fuel or water. My heads are World Products Windsor Sr. with no porting at all. I'm running and Edel carb (I know Alex don't say anything) and did not see any fuel coming out the vents. i am going to replace the crank also, might as well stroke it.

Steve,

This is 4 pictures of the #4 rod that bent. I pulled the plugs as soon as I determined the motor was locked up and all the plugs were dry and clean, but that is the only possibility that I can think of also. I just did not think the stock starter had enough torque to bend a rod.

Alex,

No, I am running a mechanical fuel pump.

The only way I can describe what happened is like when you use a pull start on a small engine and it yanks the pull rope back through your hand, the engine seemed like it tried to turn backwards. I'm like everone else and think the cylinder had some liquid in it, but I just wish I could have found some sign of it.

------------------
Ronnie
69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

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jsracingbbf
Gearhead

Posts: 2740
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 09-23-2002 01:52 AM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Ronnie, I've done this to a 351 C before. I was running a Ron's flying toliet, mechanical fuel injection. Fuel collected on top of the piston on two of my cylinders. I was running quench heads so there wasn't much room for play. Looking at your picture I would say the motor definately Hydralic-ed.
Myabe you should have those heads pressure checked. I don't know if it will work but you could put the head back on and use one of those STANT radiator testors to pump pressure up on it. Best bet would get the machine shop to check that head. Unless you think it was fuel. Stuck float maybe? I am not sure but I would think that would be rare to hydraulic a carbuerated motor. Look on the head gasket you removed to see if any water holes are tracking/ blown.

------------------
Jerry Smith
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
"Drag Racing, the most fun you can have with your clothes on"

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RonnieT
Gearhead

Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99

posted 09-23-2002 09:42 PM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
Jerry,

I agree that the motor hydraulic'ed, just did not see any evidence of water in the cylinder and did not think the starter had enough force to bend a rod. I know where the water would have come from. As I said we were cleaning the car for a show and the wife opened the hood and washed down the inner fender aprons and firewall to remove the dust, she has done this many times in the past and knows what not to wet under the hood. I run the trianglure Edel foam element air cleaner and it had a little water in the base, but did not seem like enough to cause a problem. You did bring up a good point that the engine had about a 12.7 compression ratio, so I guess it would not take much water.

------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

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Moneymaker
Administrator

Posts: 25539
From: Lyons, IL, USA
Registered: May 99

posted 09-23-2002 10:45 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Needle may have come off of the carb seat and allowed fuel to fill a cylinder. That is one way it may have hydraulic'd.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA/MCA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"

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johnmustang
Gearhead

Posts: 5818
From: British Columbia , Canada
Registered: Nov 2001

posted 09-23-2002 11:23 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
Could the fuel have evaporated after the fact , possibly why there was no evidence of any liquid. As you said the compression was pretty high 12.7 , so not much needed. Sorry to hear about the bent rod

JONH

------------------
65 2+2 FASTBACK
68 COUPE
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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lyle29464
Gearhead

Posts: 958
From: Mt. Pleasant S.C.
Registered: Mar 2000

posted 09-23-2002 11:42 PM     Click Here to See the Profile for lyle29464   Click Here to Email lyle29464     Edit/Delete Message   Reply w/Quote
I vote for alex on this one.

As far as a starter having the power to do that it may have had a little help if 1 or 2 cylinders fired on the first rotation.
puting lots of money in this before I found the problem would make me nerves.

------------------
Lyle
69 rag top 93 explorer
98 f 150 28 slick craft
"If a person must be obsessed by something,I suppose a mustang is as good as anything."

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RonnieT
Gearhead

Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99

posted 09-24-2002 04:26 PM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
Well I was planning on basically starting from scratch anyway. I am going to reuse the top end, but thats about it. I will have the heads reworked and throughly checked out before the engine goes back together.

------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

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