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Author
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Topic: Engine failure again...
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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-29-2002 09:10 AM
   
I was trying out another carb combination and when I started up there was a bad series af banging for a second or two in the passenger side valvecover. An inspection reveals the #2 exhaust pushrod is hammered down at the rocker end about 0.500" shorter than the others. The valve moves when tapped with a soft hammer. The only thing I can think of is an obstruction limiting the valve opening. Will pull the head tomorow as I'm going up the Juan De Fuca Strait from Port Alberni to Victoria today-about 12 hrs for a drydock run. Any Ideas?
Dave------------------
'70 ragtop Stang
351W - 13.70 @104.
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 09-29-2002 09:26 AM
Valve guide seized the valve stem possibly 
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SteveLaRiviere
Administrator Posts: 33988
From: Saco, Maine
Registered: May 99
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posted 09-29-2002 04:39 PM
Did you check your piston to valve clearance during assembly?Sorry to hear the news, by the way! ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 [This message has been edited by SteveLaRiviere (edited 09-29-2002).]
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Calcat
Journeyman Posts: 75
From: Los Angeles, CA
Registered: Feb 2002
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posted 09-30-2002 02:09 AM
Could you have leaned out that cylinder with your new carb combo so bad that detonation did this ?
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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-30-2002 02:20 AM
Back from the all day run up the coast and I'm still rocking back and forth... Steve when I assembled the motor I clayed the piston the valve and had 0.125" clearance. The valve is not seized, had oil coming out of the rocker last time I adjusted the valves. I couldn't see how a lean condition could occur in the first seconds of start-up. I was using 74 primarys with a 8.5PV, and 82 secondarys in the 600VS I was messing with.
I will pull it apart in the morning for a look-see.
Dave
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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-30-2002 01:00 PM
I installed a new pushrod and turned the engine over -no binding, resistance, or abnormal noises. Now I'm thinking that either the lock backed off or the motor finished breaking in and the lash widened enough to slip off the rocker pocket and get damaged. There was no abnormal valvetrain sounds before and I even now have my tailpipes on. I guess I'll just do another hot lash adjustment and forget about it.
Dave
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johnmustang
Gearhead Posts: 4504
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001
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posted 09-30-2002 02:24 PM
quote:
Originally posted by stang106:
I installed a new pushrod and turned the engine over -no binding, resistance, or abnormal noises. Now I'm thinking that either the lock backed off or the motor finished breaking in and the lash widened enough to slip off the rocker pocket and get damaged. There was no abnormal valvetrain sounds before and I even now have my tailpipes on. I guess I'll just do another hot lash adjustment and forget about it.
Dave
Dave , What is the mileage on your engine now ? I am glad it was an easy inexpensive fix. JOHN  ------------------
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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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-30-2002 03:09 PM
John,
I'm not sure of the milage as my speedo is not correct; but about 500+ miles. I'm attempting to locate a scope to look inside the cylinder before I start again.
Dave
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Moneymaker
Administrator Posts: 19751
From: Lyons, IL, USA
Registered: May 99
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posted 09-30-2002 04:56 PM
Sounds like your diagnosis is very probable Dave. Or were you snacking on some of your fish while assembling the engine and possibly left a filet or two on a piston?  ------------------
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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stang106
Gearhead Posts: 734
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
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posted 09-30-2002 05:37 PM
Iobtained a scope but it would not fit in due to obstructions. Compression test pulled 175# in both the damaged cylinder and the next cylinder. Started up and car runs fine. Will do a hot lash adjustment and measure any loose ones to see if this was the cause.
Dave
ps Alex: I guess I shouldn't tell you I'm going to hike into a 'trophy' lake tomorow and pull out some monsters! I bet there hasn't been anyone there since last year when I visited it. Gotta like Canada!
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johnmustang
Gearhead Posts: 4504
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001
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posted 09-30-2002 06:09 PM
quote:
Originally posted by stang106:
ps Alex: I guess I shouldn't tell you I'm going to hike into a 'trophy' lake tomorow and pull out some monsters! I bet there hasn't been anyone there since last year when I visited it. Gotta like Canada!
Do we have fish in Canada ?
JOHN
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