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Joined: Jan 2003
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ChatMaster - 750
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OP
ChatMaster - 750
Joined: Jan 2003
Posts: 977 Likes: 7 |
On several engines, I have seen the oil return tube on the rocker arm shaft connector ( group # 1.928 ) crimped closed. I suppose this was done to restrict the flow of oil through the oil return tube and increase the flow of oil though the shafts and into the rocker arms. What are your thoughts? Is this a good practice?
Bill Masters
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
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Posts: 19,758 Likes: 64 |
Bill,
The technique was used to compensate for wear on the shafts and bushings that kept oil from reaching the rockers at the far ends. It typically caused leaking at the valve cover as the amount of oil dumped on top of the head was greater that designed.
It is much better to put in new bushings and shafts and open the tube to its original dimensions. The slight rise in the oil path above the shafts gives the low oil pressure that is all that is required to lubricate the valve train.
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
If the valve train is in good condition and oil supply lines and passages are clean it is totaly unnecessary.
Gene Schneider
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Joined: Jan 2003
Posts: 977 Likes: 7
ChatMaster - 750
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OP
ChatMaster - 750
Joined: Jan 2003
Posts: 977 Likes: 7 |
Thanks guys. I was curious. I installed new shafts and bushings on my engine, and the connector is not modified.
Bill Masters
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Joined: Jul 2006
Posts: 14
Grease Monkey
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Grease Monkey
Joined: Jul 2006
Posts: 14 |
I have a low oil pressure 235 (51,pg). Where are the bushings in the valve train? Shafts, rockers, towers and springs. But bushings?
Glenn,
GEC
Good, economic and classic
Scootin thru the 50s
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Joined: Aug 2002
Posts: 114
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Aug 2002
Posts: 114 |
Glenn,
The bushings referred to are the ones pressed into the rocker arms -- they're replaceable.
Scott
Scott Andrews
Dacula, GA
#J25833
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The 1941 and up did not have bushings.
Gene Schneider
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Joined: Jul 2006
Posts: 14
Grease Monkey
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Grease Monkey
Joined: Jul 2006
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Thx Guys. For a minute my foundation was grumpling.
GEC
Good, economic and classic
Scootin thru the 50s
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