Rocker arm assyembly
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Rocker arm assyembly
[font size="1" color="#FF0000"]LAST EDITED ON 18-Mar-01 AT 01:49 PM (EST)[/font][p]Yesterday me and my dad started out to fix a bent pushrod I found when I was replacing some leaking valve cover gaskets.No problem went to the store got another pushrod and replaced then I started it up with out the valve covers on just to make sure the push rods were turning and looking good and I noticed the passenger side rocker arm assembly was only oiling the front four rockers the back four were not getting any oil so just to make sure that it was a bad rocker arm I switched sides and it still did it.So I took the rocker arm apart to see if it was clogged up but it looked fine I did noticed that when it was running the front four that was getting oil was getting a lot of it.Is it possible that the front four rockers are wore out and letting to much oil out and depriving the back four?Thanks
1973 f100 390
1973 f100 390
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
Rocker arm assyembly
Sounds like the rocker arms and/or shaft are worn. This is common on FE engines. Also check that the shaft is not upside down, they have holes that must point downward. Most of the sets that I've seen have a lot of wear on the underside of the shaft and the inside of the rocker arms. Also, the bolt placement is very important as well, there are three different bolts: 2 standard, 1 long reduced shank, 1 reg length reduced shank. The reduced shank ones go to the inside and the standard ones go on the outside. The long reduced shank goes in the hole where the oil supply feed is.
If the rockers are worn, you should see oil out the side of the rockers instead of out the little hole at the tip.
Standard replacement rocker arms are about the same price as the adjustable ones and are overpriced in my opinion. I found an excellent set at the junk yard for $7 a side. You can check the condition by moving the inner rocker arms to the side and looking at the wear of the shaft, the shaft is usually less worn than the rocker bushing. Also, look at the tip that touches the valve, I've seen some with a lot of wear there.
Again when you put them back together the oil holes on the shaft must point down.
The actual amount of oil to the valve train is small and some even restrict this oil flow, but at idle it should just drip out the tip and not quite overflow the valve cover area.
If the rockers are worn, you should see oil out the side of the rockers instead of out the little hole at the tip.
Standard replacement rocker arms are about the same price as the adjustable ones and are overpriced in my opinion. I found an excellent set at the junk yard for $7 a side. You can check the condition by moving the inner rocker arms to the side and looking at the wear of the shaft, the shaft is usually less worn than the rocker bushing. Also, look at the tip that touches the valve, I've seen some with a lot of wear there.
Again when you put them back together the oil holes on the shaft must point down.
The actual amount of oil to the valve train is small and some even restrict this oil flow, but at idle it should just drip out the tip and not quite overflow the valve cover area.
