piston rings

Z-man

Member
does any one know which way to turn the pistons rings before reinstalling them into the sleeves, I have a T030 Z129 continual engine will it matter which way they are turned at install and also I'm looking for torque spec settings for the head, connecting rods and rocker arm valve rod bolts that hold it to the head?
 
If you mean their orientation in relation to the other rings, if there are no keepers that hold them in place then you would offset them so the gaps are not all lined up with one another. I believe they rotate when in use anyway if there are no keepers. Come to think of it, in a 4 stroke engine there would be no real need of keepers, that's just a 2 stroke thing to keep the ends of the rings from getting snagged on an intake or exhaust port.
 
thanks, that is what I thought and hoped for someone to agree with my theory cause there are no keepers and it is a four stroke engine, would u happen to have any torque settings for the z129 engine?
 
Not for a 129, mine both have 134 engines. There's got to be information if you do a search through the archives on this site.
 
I remember years ago I went to Briggs and Stratton school and they showed us a video of an engine that had a cut away at the cylinder and sure enough while running the rings do turn on the piston. Everybody has their way to install rings the main thing is to make sure none of the gaps line up or are even close to each other. Usually on a 3 ring car engine I install the oil ring with the gap over the piston wrist pin. Then I install the top and bottom expanders with their gap 180 degrees from each other. Then install the second ring with the gap to the bottom side of the piston and the top compression ring with the gap towards the top side of the piston. I"ll see if I can get you a pic.
 
(quoted from post at 15:46:40 09/08/13) I remember years ago I went to Briggs and Stratton school and they showed us a video of an engine that had a cut away at the cylinder and sure enough while running the rings do turn on the piston. Everybody has their way to install rings the main thing is to make sure none of the gaps line up or are even close to each other. Usually on a 3 ring car engine I install the oil ring with the gap over the piston wrist pin. Then I install the top and bottom expanders with their gap 180 degrees from each other. Then install the second ring with the gap to the bottom side of the piston and the top compression ring with the gap towards the top side of the piston. I"ll see if I can get you a pic.

On a 4 ring piston, and this is a Ferguson piston I'm holding I do the oil ring and expanders the same. In the pic the right hand side of the piston goes to the front. I install the oil ring gap over the right hand side of the wrist pin, and then the expanders 180 degrees from each other. The second ring I turn the gap to the back and then the compression ring and the third ring I install with the gaps 90 degrees from each other.

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head 75 foot pound
Rod cap screws 45 foot pounds
I don't have torque for the rocker arm shaft. But if you do a search on google/yahoo for standard torque specs you will find charts for torque based on thread & bolt diameter that is useful for all the general bolt-up on the engine. Use the grade 5 torques for anything threading into cast iron.
 
thanks, that's helpful though my piston only has a total of four rings but helpful. by the way do u know how to set the timing on a t0 30
 
I have not moved the timing at all yet so i'm thinking timing it while running. I believe it should be real close rite now but I would like to check it so I know it is rite on for max power when in use. also I was going to use a timing lite but is there an advance that needs to be dressed before I try to set the timing or do I just put the lite on number one and look through the timing window?
 
You have to have it idling at 400 rpms to set the timing. Anything above that and the advance in the distributor will be kicking in. Have it idling at 400 rpms and shine the timing light in the hole and set it to 6 degrees BTDC.
 
ok sounds good what if it idles a wee slower than 400 rpms would that hurt, or does it have to be rite on 400?
 
A little slower will be ok because the advance won't start advancing the timing until you start going above 400 rpms.
 

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