rocker arm stud weirdness
- chachi
- Old School!
- Location: ne pdx, or.
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- RSorak 71Westy
- IAC Addict!
- Location: Memphis, TN
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Re: rocker arm stud weirdness
Yes it can be repaired with a Helicoil kit.....The kit includes a drill to drill out the hole to a larger size. And a tap to thread that hole for the insert. Then some inserts to screw in that return the hole to it's original size.
Take care,
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
- Amskeptic
- IAC "Help Desk"
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Re: rocker arm stud weirdness
This must be a repeat of the post I saw in troubleshooting forum. If you can get a straight 10X8Xwhatever length stud and tap out the holes to a clean 10mm thread, I would hesitate to use helicoils because this is a very demanding enviroment, unlike a simple exhaust thread. The vibration of a valve train at speed is something to see. The combustion chamber heat just underneath is also going to work those helicoils into a froth of fretful.chachi wrote:went over to help a friend adjust his valves today after he was complaining of having lost a cylinder. when we got the rocker cover off the pass. side we immediately saw the problem. the retaining nut on the right side #1 rockers was off. upon closer inspection however, it was evident that this was not his real problem. the stud on the left hand side pulled right out. what is the solution for this besides a new head? can an insert be put in?
here's the pic, note the weird square spacers which i've never seen before:
Colin
(p.s. assume that the rocker stand shims are mandatory for valve train geometry. Please make sure that they are fully contacting the rocker stands, i.e. perfectly aligned underneath)
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
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Re: rocker arm stud weirdness
yeah, he posted a thred on TS, same pics. i just like you guys better. :)Amskeptic wrote: This must be a repeat of the post I saw in troubleshooting forum. If you can get a straight 10X8Xwhatever length stud and tap out the holes to a clean 10mm thread, I would hesitate to use helicoils because this is a very demanding enviroment, unlike a simple exhaust thread. The vibration of a valve train at speed is something to see. The combustion chamber heat just underneath is also going to work those helicoils into a froth of fretful.
but...yeah...i was worried about what you're talking about. there's so much vibration and..."action" going on in that location. so can you just get a larger stud size? we were wondering how the studs stay in when they originally put them in...how do they not loosen up? for that matter, how do the heli-coil inserts stay in?
1974 transporter panel, 2.0 dual solex
1991 vanagon NAHT, RJE 2.3
1991 vanagon NAHT, RJE 2.3
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Re: rocker arm stud weirdness
Studs directly in contact with the aluminum will do fine so long as they are a nice snug installation. Helicoils are merely a steel thread wound up like a spring and will vibrate and chafe to the springs' harmonics and erode the aluminum .... don't.chachi wrote: we were wondering how the studs stay in when they originally put them in...how do they not loosen up? for that matter, how do the heli-coil inserts stay in?
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
- Status: Offline
- chachi
- Old School!
- Location: ne pdx, or.
- Contact:
- Status: Offline
- RSorak 71Westy
- IAC Addict!
- Location: Memphis, TN
- Contact:
- Status: Offline
Re: rocker arm stud weirdness
I disagree that a Helicoil will fail in this spot, but that's irrelevant, if you can find a step stud. That is an easier repair, but only marginally easier.
Take care,
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
-
- IAC Addict!
- Status: Offline
Re: rocker arm stud weirdness
step studs available at napa. the stripped hole was an 8mm stud you need is a 10mm on the head end and an 8mm on the rocker block end.
1/20/2013 end of an error
never owned a gun. have fired a few.
never owned a gun. have fired a few.
- ruckman101
- Lord God King Bwana
- Location: Up next to a volcano.
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Re: rocker arm stud weirdness
I had those studs strip out of my 1200 cc heads many a moon ago. Baffling lack of power, then nada. At the time, I had help and kinda recall pulling the head so a machine shop could do the work. Sheesh, like thirty years ago. Dang I'm a geezer.
neal
neal
The slipper has no teeth.