Wayne-head stud question

[ChrisBennet]

That's great Sayah (that you didn't have to fix the case). Anecdotally, the 2.7's seem to be the ones I hear about having twisted cases. Maybe that's because there are more of them?

Perhaps the mild horsepower of the "2.0E" has mitigated the tendency to pull studs in your motor? For your sake I sure hope your are able to tell us "Nyah, Nyah" after a 1000 miles. I would suggest avoiding situations that get the motor really hot i.e. 90 degree stop and go traffic. I've got my fingers crossed for you.

You mentioned that the motor had a couple of "blown head gaskets". What was the cause of that? Were some head studs loose enough to let the head lift off and flame cut the head sealing surface perhaps?

Normally, one measures and just replaces the parts that are out of spec. I don't think anyone will disagree with you on the point. The head studs are a different animal though. You can't tell if they are good just by examining them. On a mag case, it isn't the head stud that you are really worried about, it's the case around the head stud threads. The "address the case stud" mantra has been arrived at by hundreds (thousands?) of people figuratively being struck by lightening after assembling mag case motors with "good looking" head studs. They drive a few hundred happy miles with their rebuilt motor thinking that the storm has passed and then "Zap!".
-Chris

[sayah]

Well Chris I hope this doesn't happen also. I put in hour and hours (happily) and broke a few parts in the process to get where the engine is about ready to go back in the car. Spent about 1500.00 and in the process took the transmission apart to inspect and replace any obvious worn parts.

The head gaskets blew because the studs and nuts lost their torque. The chain drive train was pretty worn. The mech chain tensioners were just barely holding on. My engine exibited NONE of the more dramatic and costly symptoms people talk about on this news group all the time. Everyting was quite prosaic, worn parts, missing gaskets, when the last overhaul was performed, thus causing leaking and smoking. I managed to get a set of used "e" pistons, which were in better shape than mine, re-ringed them, put in a newer oil pump, new bearings, a new valve. Right now I'm waiting for my machinest to bush my idler sprockets.

The reassembly has been just so smooth, the engine without any case work, except for the oil bypass modification has bolted up like butter. Squeezout is uniform. My guess is that when I finish the whole thing will most likely give years of trouble and hopefully leak-free service.

The UPS man is convinced that this is all therapy for me but I keep insisting that its just to get a great running sexy car for a low price.

[adomakin]

long before i knew about this site and waynes book i thought id rebuild my'75 2.7 mag case engine. two studs had pulled , so i helicoiled the two damaged ones (yes i know-HELICOILS????) and replaced all the studs with new dilavar studs (yes i know-DILAVAR????). 200 miles down the road and id pulled some more on the other side. I probably wouldn't have junked the motor and started throwing HIDEOUS amounts of money at a 400hp 930 engine build if id have read the book, spoke to blokes at this place and dunit proppa the first time round! (having said that, the down side to doing the 2.7 proppa would have meant that i wouldn't have my 400hp 930 engine so, in hindsight, thank god they pulled!

[Doug Steinel]

Mark,

Did you finally get all those Dilavar exhaust side studs out? Is the rebuild progressing?

Doug

[Doug Steinel]

bump

[markwemple]

Doug, Just borrowed an O/A set up from a local P-head and have to buy an adaptor to make the tanks work. Hopefully this weekend will prove fruitfull!

[Doug Steinel]

Mark, I have to pick up my MAPP gas stuff... I am taking off my exhaust. What day this weekend is good for you? Maybe I could help you with the Oxy technique. You pound, I't ll heat it.

Doug

[AndreasLanghoff]

Sayah,

I completely agree with you on the case struds. Your engine is a 69E , and if the struds are firmly in the case, there is no need to put time-serts or case savers in it. This is the experience of the italian workshop where I had recently rebuild my engines.
On my case we put in time-serts (because it is 2.7 now) , and it took hours of heating, oiling, etc. to get the struds out. You twist the strud by 90 degrees, but it will not come out. So also in a MAG case the struds can be well fixed!!

Andreas

[markwemple]

Sounds good Doug. We will have to get in touch late Friday to see if Sat or Sun is better. Not sure now. Let's hope that the O/A does the trick!

[Doug Steinel]

Mark, I think the Oxy/Act will do the trick. Give me a call when you know more about day/time. 301-596-0407 or cell at 410-262-1574.

Doug

[john walker's workshop]

did it work, the suspense is killing me?

[markwemple]

All but one. That one I will be trying Wayne's canned air trick. We spent over 1/2 hour w/ constant heat. NO KIDDING! Beyond stubborn! Anyway, I hope we haven't dammaged anything. I don't think so but am a little worried.

[markwemple]

Last night we had success! My GF and I spent 1 1/2 hours on that last stubborn stud. Here is the successful technique - heat w/ OA for 1/2 an hour and keep heating, hit with a hammer until your hand hurts, use 2 very good pairs of locking pliers, use a liberal amount of Wayne's canned air trick and the kicker, use a jerking motion (like and impact tool) to mover the pliers. I spent 3/4 of an hour, once it began to move to finish pulling it. The biggest PIMA in my life bar none!!!!

[Doug Steinel]

Mark, congrats. Sounds like your GF should be your helper in future projects. When I was helping you, it wouldn't budge. Now that you got that out of the way, any more obstacles to reassembling? If you need help in hanging the engine back in, I am willing and somewhat able.

[markwemple]

Thanks Doug! No, you did fine, I just had the cold air and the impact notion. I was simply more stubborn than it was, I guess. I wonder if 3 hours on a single stud is some form of record and if so, do I really want to hold it?

Take care!