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1995-2002 Range Rover P38A
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166 Posts
Discussion Starter #1
Hi all,

I have a noisy lifter in my P38 engine and adding some lifter tune up has not solved the issue so I intend to replace them.

While I am at it I am thinking very seriously about a set of smiths adjustable pushrods

I know that the standard pushrods are 8"/203.2mm long and 5/16"/8mm diameter, but smiths are asking about the tip sizes for the rocker end and the lifter end.

Can anyone help me with these dimensions?

Thanks
Steve

PS: Smiths full reply to my query
"Our adjustable pushrods have a max adjustment of 1/4" from collapsed. So we just need the length you would like them at and the tip sizes for the rocker end and the lifter end. We can typically make and ship within 24-48 hours."
 

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1995-2002 Range Rover P38A
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484 Posts
just send them one for reference , carnt get it wrong then . just pull out the end piece if that's all they want
 

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2,082 Posts
I have to ask why? The only time the pushrod length needs to change from standard is if the heads have been skimmed making the pushrods too long. Usually there is enough in the hydraulic follower to keep the preload in spec but if there isn't, you'd need to simply add spacers under the rocker shaft pedestals. Spacers are available in different thicknesses (see https://rimmerbros.com/Item--i-603734ASH for a set containing 3 different sizes) and here is how to check if you need them http://www.v8developments.co.uk/technical/valve_train/index.shtml
 

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1995-2002 Range Rover P38A
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166 Posts
Discussion Starter #4
I have to ask why? The only time the pushrod length needs to change from standard is if the heads have been skimmed making the pushrods too long. Usually there is enough in the hydraulic follower to keep the preload in spec but if there isn't, you'd need to simply add spacers under the rocker shaft pedestals. Spacers are available in different thicknesses (see https://rimmerbros.com/Item--i-603734ASH for a set containing 3 different sizes) and here is how to check if you need them http://www.v8developments.co.uk/technical/valve_train/index.shtml
Hi

My heads have been surfaced and I am running MLS head gaskets so I am investigating the adjustable pushrods as an easier option to get the preload in spec

Shims are Ok but I still have a fair bit of individual variation in preload

Steve
 

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1995-2002 Range Rover P38A
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166 Posts
Discussion Starter #5
This info may be useful to someone in future

the pushrods are 8" long, 5/16 diameter. The tips are 3/16 radius or 3/8 diameter

It has been suggested that using chev style oiled pushrods is beneficial as well

Steve
 
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