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Discussion in 'Airheads' started by vacantstare, Sep 13, 2010.
Try a really good industrial hardware supply outfit.
You can repair the stripped threads in the head with a helicoil which is a steel spring-like coil that threads into the stripped-out hole. Helicoils can loosen over time and surprise you when you remove the cap nut - instead of the cap nut coming off the stud, the stud and cap nut comes out of the head with the helicoil affixed to it.
A better method is using a Time-Sert which is a solid threaded insert placed into the head. A kind of solid helicoil of sorts. A third method of repair is to replace the stud with a piece of 8 mm threaded rod about 74 mm long ( the original stud is 8 x 70 mm long ). The stud hole in the head already goes all the way through the head to the air space below the spark plug lead. The extra 4 mm threads into a nut slipped down in that airspace. The nut pulls up against the head and this stud will never pull out. I had to grind two flats of the nut to fit down in the space. I originally repaired both of mine with helicoils. When one helicoil backed out later I used the 74 mm all thread to be done with that one and made another one up if the helicoil ever fails on the the other side.
A better method is using a Time-Sert? That is highly debatable so I will throw in the other side of that aurgument.
For starters, if installed correctly coil inserts (Helicoil is a brand name coil insert) don't back out. There main advantage over a Time-Sert is that the entire coil insert resists backing out via spring tension versus one small segment of a Time-Sert. BMW and every other factory that I can think of uses coil inserts to strengthen threads for this reason. Everyone should check out their airhead's engine's female threads. Lots of them have coil inserts from the factory. Have they pulled out? I have never seen one do it. Many of the threads for the transmission bolts as well as well as threads for the timing chain cover have coil inserts to strengthen the threads from the factory. Other brands use them as well. It's because they work better than Time-Serts in our opinions. I don't remember ever seeing a factory installed Time-Sert
People make two big mistakes installing coil inserts. The first is that they often use too short of an insert and the bolt doesn't get near enough purchase. The second thing is that they leave the ends of the inserts too close to the ends of the insert's threads. The ends of the insert are its weak points. They need to be well protected by at least a full turn of thread on BOTH sides of the insert.
You can always jam a nut behind the center studs hole and thread the stud into the nut. It works in a pinch.
I will be able to talk about the time sert soon as I am going to repair a spark plug hole with one on my Trooper.
Geeze, Sniper. Don't tell me that you have a 4 cyl 1st gen Trooper. That'd make you a genuine throwback of some kind.
thanks for all the solutions guys! this is why i love this forum, los of experience. thanks a bunch again.
will probably try and find a longer bolt and put a nut back there, as a don't think i'd get the heli-coil thing right first time. i am pretty sure it already had a helicoil repair anyway, it backed out real nice when undoing the center nut.
I prefer the two piece rocker covers. :
Here's one i had in earlier.
Sibenrock still sells proper two piece ones , but not cheap compared to bodging them yourself/
Dood, I'm like Cromagnon! I have a 86, 91, and a 97 trooper! My 97 spit a plug out about 3k miles after i bought it because the PO (fukin dumass) didn't tighten them right when he replaced them before I got it. The 91 I got for $100.00 and it is in excellent shape save for the hole in the oil pan where a rod bit came flying out after the girl i bought it from let her EXTEREEEMMMEEE boyfrend off road it one night.
What's the benefit for the 2 pieces cover? Beside swimsuit?
Better sealing when the head is warped?
also if you've got a couple ground up valve covers, you can halve them and make 1 outa 2 !!
I think my pal Larry cried when he sold his 85 Trooper. He loved that thing. I never quite understood the Trooper thing until he explained it to me.
Bringing this back from the dead. Anyone have any more info on these valve covers other than what was previously mentioned?
What more could you possibly want to know? They're CC Products "Cool Covers" and they're NLA as of a long time ago.
If you advertise on the web, you can sometimes find a used set for a couple hundred bucks or so but mine aren't for sale. Yet...
The two piece covers were developed for rally racing. You could carry just 1/2 a cover as a spare. Mostly a weight saving thing.
Wow, here's my very first post about airheads back on the first page again.
And now, 1 1978 R100/7, 5 months, 2 girlfriends (only one was a casualty of the bike), and I don't want to say how many thousands of dollars later, I'm replacing starters, rebuilding forks, upgrading brakes, getting stuff painted and wondering every day what I got myself in to.
And I have no regrets. I love the thing.
Well, I too went back to the front page and found this ^ !! Brilliant, indeed!
I wish there was a valve cover similar to old VWs that just clipped on and off.
The bail probably wouldn't hold up well in a crash. Then the valve cover falls off, crud gets in the valve train and getting back on the road is a bit more complicated.
Some of these design elements were actually the result of thoughtful study.
My parents had an 87 trooper...great trucks...basic. Until you let a garage do the valves and the destroy them at 120k. My first truck was the 1992 2wd 4cyl Isuzu PU. Did I have fun in that truck