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Broken pushrod
#219363 09/17/11 01:00 PM
Joined: Sep 2010
Posts: 94
South Africa
Oukar Offline OP
Shade Tree Mechanic
OP Offline
Oukar
Shade Tree Mechanic
Joined: Sep 2010
Posts: 94
South Africa
Hi Guys,

After starting her this morning, I removed the top cover to find that one rocker is standing still. Removed the side cover and found one half behind the side cover and the other half hanging loose from the rocker arm area.
The push rod broke off clean and the rod was slightly bent.
What can be the cause of this?

The engine run beautifully and I made sure the timing settings in front are set 100%.

Any ideas?

1931 Sport Roadster
Restoration in progress
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Re: Broken pushrod
Oukar #219365 09/17/11 01:13 PM
Joined: Sep 2010
Posts: 94
South Africa
Oukar Offline OP
Shade Tree Mechanic
OP Offline
Oukar
Shade Tree Mechanic
Joined: Sep 2010
Posts: 94
South Africa
More info,

Pushrod 1 is also slightly bent, but very slightly.
The rod that broke is the 5th one from the left.

1931 Sport Roadster
Restoration in progress
Re: Broken pushrod
Oukar #219366 09/17/11 01:27 PM
Joined: Jan 2002
Posts: 30,701
Likes: 141
West Allis,Wi.
Chev Nut Offline
ChatMaster - 25,000
Offline
Chev Nut
ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701
Likes: 141
West Allis,Wi.
usually caused by the valve sticking in the guide......oil valve guide with MMO or ATF

Gene Schneider
Re: Broken pushrod
Chev Nut #219391 09/17/11 07:46 PM
Joined: Dec 2010
Posts: 680
Long Island, NY
67vetteal Offline
Oil Can Mechanic
Offline
67vetteal
Oil Can Mechanic
Joined: Dec 2010
Posts: 680
Long Island, NY
Always add 1/2 ounce of MMO per 1 Gallon of Gas. It really helps to Lub the guides. Al W.

It's Wise to choose a six!
Re: Broken pushrod
67vetteal #219580 09/20/11 09:47 AM
Joined: Sep 2010
Posts: 94
South Africa
Oukar Offline OP
Shade Tree Mechanic
OP Offline
Oukar
Shade Tree Mechanic
Joined: Sep 2010
Posts: 94
South Africa
Sticky valve was the problem.

Added some valve release agent and Bobs your uncle. In South Africa we dont have MMO

Thanks for the insight.

1931 Sport Roadster
Restoration in progress

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