Aussiebill, love your sunliner as well, my dad had the twin to yours back in the early sixties down to the same color. I started getting my rocker arms from rocker arm specialties in ca.  the later Doves I bought worked very well with no complaints, But Steve at rocker arm specialties uses a bronze bushing instead of letting the aluminum ride on the steel shaft and does the same trick as Ted on the shaft and grooves the bushing as well. I believe that's the way to go for me.   

Charlie, hope you find the problem with the breaking pushrods, just make sure they are sized correctly and that there is enough adjustment on the ball so that the cup doesn't come into contact with the rocker as it opens fully.

-Gary Burnette-

 Bingo!!! Especially since the end of the pushrod looks to have a larger od cup than the tubular version. At least from the photos. The cup wear sure looks like a too small recess though in all the photos.

Frank/Rebop

Bristol, In ( by Elkhart) 

The push rods are not close enough to hit the rockers.



The older set of pushrods do have the wear pattern deeper in the cup. I'll get a picture soon. I think the answer is that the cup was too small. I picked up a checking pushrod today. If it doesn't rain tomorrow, I'll figure out the optimum length.


Lawrenceville, GA

It's probably not relevant now, but a friend years ago had what appeared to be oiling problems with Y-Blk rockers made by Thomas. One of the rockers seized on the shaft & broke. However, I don't think those rockers have been made in years.

Paul

---

The Dove rockers were given a clean bill of health.  But here’s more detail.  When examining the damage at the end of the camshaft breakin, the Dove rocker adjusters were at the top of the suspect list as it had been quite awhile since a defective pushrod has come through the shop.  The Dove rocker arm adjuster balls were checked first for size as they are obviously much easier to check than the cup sizing in the pushrods.  But the Dove adjuster ball size measured within 0.004” in size as the factory adjusters so there was no obvious issue there.  Moving on from this is when the pushrod cups were checked and a real problem being found.  As mentioned before, the pushrods were changed out without any changes to the rockers and the pushrod breakage issue disappeared.

 

Proper oiling to the pushrods when using Dove roller rockers is facilitated by grinding an angled slot across each rocker shaft oiling hole.  The machined groove in the Dove rockers tends to be misaligned with the rocker shaft oil holes and using an angled oil slot aleviates this.  But a problem found with the Doves are the occaisional rocker(s) where the aforementioned groove hasn’t been machined into the rocker bore.

Lorena, Texas (South of Waco)

Guys,

I am having a great Sunday afternoon doing what I like best, building engines, and I am in the middle of a 292 for a guy in Texas that has asked me twice to build Ys for him. What I have is a set of push rods that were purchased from John Mummert and as you can see they have a perfect fit ball to cup. I sprayed the cup with graphite and rubbed the rocker ball around in it to mark it and the pattern was just right. I just want to post these pictures to show that if there were some bad push rods out there I'm sure John dose not sell them knowingly.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Correction, The part number is MPR - 73.



So, will one that fits right contact the cup completely, rather than leaving a thin ribbon of contact? I can't tell from the pic, Tim. It looks like the camera focused on the stuff on the table.



Lawrenceville, GA

Tim, I don't think anyone is pointing fingers of blame, but rather, we all praise this site for not hiding the weenie and showing a real problem exists.  Once the problem is identified and a solution is found, we can all breathe a little easier.  As destructive as this problem is, it has a very simple, low-cost solution.

You're a good Machinist/Die Maker, Tim.  Could you shoot a light coat of layout fluid in that cup, and show some mating witness marks?  As long as the ball seats at the bottom, it may have up to a .010" clearance fit.

 -  Dave Dare

Royal Oak, Michigan (Four miles north of Detroit, and 12 miles NORTH of Windsor, Canada).  That's right, we're north of Canada.

Ford 292 Y-Block major overhaul by simplyconnected

I think the picture a few posts back shows the proper contact area better, it's hard to get a perfect picture with detail, it is touching a good 2/3 of the cup but not the upper edge.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Ok. That's what the pushrods out of my old set look like. I guess I'll just swap the 15 remaining back in while I wait for the new ones.


Lawrenceville, GA