rocker installation question 351w please help!
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From: hershey, PA
rocker installation question 351w please help!
hi i just had my heads redone and i got them back today. (by they way its a '79 315w engine) i torqued the heads down, and installed the push rods back into position. I put all the push rods back into their original positions (didnt mix them up). now, i have a book on the subject of torquing down the rockers but im not sure how this works. the book says all 351ws do not have adjustable rockers. I think i did it correctly but i need to clarify a ?.
The book says rotate the engine to tdc, then 180, then back 90 and while doing that, you tighten different nuts. It says torque 18-23 ft. lbs. Am i doing this right? after i torque the selected nuts at the certain positions, without moving the engine, some are tight and some are a little loose(im only referring to the ones that would be closed at those positions). now i know you dont want them tight because then the valve will be open. And if they are loose, are those nuts going to vibrate off? can somebody please answer my question so i can finish the job tonight.
thanks a lot!
Jim
check out my jeep site http://modifiedjeep.tk with my cj7 <a href="http://www.motorhaven.com/">351w </a>conversion
The book says rotate the engine to tdc, then 180, then back 90 and while doing that, you tighten different nuts. It says torque 18-23 ft. lbs. Am i doing this right? after i torque the selected nuts at the certain positions, without moving the engine, some are tight and some are a little loose(im only referring to the ones that would be closed at those positions). now i know you dont want them tight because then the valve will be open. And if they are loose, are those nuts going to vibrate off? can somebody please answer my question so i can finish the job tonight.
thanks a lot!
Jim
check out my jeep site http://modifiedjeep.tk with my cj7 <a href="http://www.motorhaven.com/">351w </a>conversion
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rocker installation question 351w please help!
I have seen those instructions in chiltons and haynes manuals, and never have figured out what they are talking about.
The valve train is not adjustable, you just tighten them down, and it doesn't matter where the engine is positioned. If the machine shop did their job correctly, and you have a stock cam or a cam with the same as stock base circle, it should be ok. The rockers that are loose, will tighten up when you start the engine, and oil fills the lifters.
If you look at how it's put together, you will see you are tightening down a bolt till it bottoms out on the fulcrum slide. More or less torque, or the position of the engine willl have no effect on the valve lash. I haven't a clue what they are talking about in the book.
The valve train is not adjustable, you just tighten them down, and it doesn't matter where the engine is positioned. If the machine shop did their job correctly, and you have a stock cam or a cam with the same as stock base circle, it should be ok. The rockers that are loose, will tighten up when you start the engine, and oil fills the lifters.
If you look at how it's put together, you will see you are tightening down a bolt till it bottoms out on the fulcrum slide. More or less torque, or the position of the engine willl have no effect on the valve lash. I haven't a clue what they are talking about in the book.
Last edited by Franklin2; Mar 29, 2003 at 06:27 PM.
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