SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: sandman on August 11, 2009, 10:33:02 PM
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Guys need some help. just putting new motor together decided to replace the old stock rockers with some stainless 1.7 rollers but im trying to adjust but new lock nuts barely grab thread before placing tension on pushrod almost seems rolcker studs are not long enough these are suppost to be stock replacements any advice?
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Good thing you checked, guess you need some longer ones like ARP or something. Might want to check pushrod length while you are at it.
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Make sure the flat side of the trunnion (rocker pivot) is up. Otherwise the nut will bottom out before it is supposed to.
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That's the first thing I thought of was pushrod length. However, for the nut to barely grab the end up of the stud is a bit extreme for the pushrod length isnt it? Is the problem on all of the studs or just certain ones? Make sure everything is seated properly! Any valve/spring work done that may have changed something?
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yay know about that one keep the suggestions coming boys!
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Make sure the flat side of the trunnion (rocker pivot) is up. Otherwise the nut will bottom out before it is supposed to.
And HOW do you know this Crewcheif? :sly:
I know a SHUDDAP! is coming, lol.
Ray
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That's the first thing I thought of was pushrod length. However, for the nut to barely grab the end up of the stud is a bit extreme for the pushrod length isnt it? Is the problem on all of the studs or just certain ones? Make sure everything is seated properly! Any valve/spring work done that may have changed something?
well heads were completely gone thru but seems to be same on all int. and ex. i think i may have to alter my pushrod length :banghead:
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this is b.s. these were suppost to be stck replacement makes me wanna go back to the stockers :mad:
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Will the stock rockers fit properly?
Maybe they are the wrong rockers?
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wen i went to roller tip rockers they came with longer studs.
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Will the stock rockers fit properly?
Maybe they are the wrong rockers?
yay the stock rockers will go on maybe these are the wrong ones gonna check my part#
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Guys need some help. just putting new motor together decided to replace the old stock rockers with some stainless 1.7 rollers but im trying to adjust but new lock nuts barely grab thread before placing tension on pushrod almost seems rolcker studs are not long enough these are suppost to be stock replacements any advice?
this is b.s. these were suppost to be stck replacement makes me wanna go back to the stockers :mad:
The rollers are supposed to be stock replacements for the shoe-type stockers??? Uh, I would be very surprised...
Most all the different aftermarket rocker arm manufactures create their rocker arms however they believe they should be designed. (Some manufacturers do copy others, but not most.) This means that because most are different, you will likely need to change out pushrods most every time that you change roller rocker brand. This is necessary in order to maintain good valve train geometery. Rarely are roller rockers a drop-in deal with no other changes. Sometimes the studs will need to be longer, sometimes the underside of the rocker body will need to be relieved, sometimes you may need to add lash caps for retainer clearance, etc. And if the geometry is way off after just dropping the rocker arms on and not adjusting pushrod length, you may have bigger engine problems down the road...sometimes sooner than later.
The challenge of learning about and setting up engines properly is supposed to be fun and part of the adventure. If you think all the necessary effort is "bs" and it confuses you, then get out of your engine and learn more about what you are trying to accomplish...or enlist the assitance of somebody that is well versed in this area. An enducation in "Rocker Arm Geometry 101" cannot be explained in a single post.
LO
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well heads were completely gone thru but seems to be same on all int. and ex. i think i may have to alter my pushrod length :banghead:
What I was trying to say is that in addition to getting the correct rocker studs you will need to make sure the pushrods are the proper length. You can probably check pushrod length and rocker geometry if the rocker nut will catch 3 threads on the stud so you may only have to make one trip to the parts store.
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Thanks for all the input guys you have pretty much confirmed my thoughts on this little problem rocker geometry is off and pushrods are the culprit time to get out the adj. pushrod and go to town THANKS ALL