stuwk1

I have an 87 turbo ii rx7 engine and tranny, that has a cracked rear side housing I want to know if i am able to weld this crack so I will post pics, and tell me what you think. The engine has been sitting outside for a few months, and has some rust on the inside, and alot outisde, making it a current / future rebuild project. The engine is a shortblock and only has a few pulleys, turbo, intake manifold, exhaust manifold, clutchplate, pressureplate, flywheel, all inside engine parts, and throttle body. This car is meant to be a fast street car, and a future drifting project car. I need to know what parts I absolutely need that bolt directly on the engine, i.e alternator.
Crank Angle Sensor
Alternator
Starter

This car does not need an air conditioning or other cockpit comfort things. I am new to rotary's and will not mind if someone simply posts a link to another thread relating to one of my questions, i am sorry my forum searching skills fail quite hard.

Pictures of the crack. The Housing is cracked on both sides of the circle but the left side is more visible.

Wankel7

Freeze damage?

arghx

iTrader: (3)

of course you can weld it, the question is how long will it hold? and nobody here can answer that with any certainty

stuwk1

well i had read that for the housings the heat from the welder can cause epic warpage.

arghx

iTrader: (3)

you meant that you were going to disassemble it right?

jjwalker

Well, weld it and then check the tolerances. Simple enough.

HAILERS

Isn't that crack just along a Flange line???? Was this engine dropped and that is what caused the crack?? How 'bout a picture from the rear of the engine showing what is behind that crack?

MIght stop drill the crack at both ends prior to welding it.

stuwk1

of course

stuwk1

i have absolutly no idea how the crack came about i know i didnt drop it, but when i bought it they said there was a coolant leak, and im guesssing thats it? I still have to disassemble it but im stuck on the eccentric shaft pulley bolt.

HAILERS

I think I've a old rear housing laying in the back yard, and I think tomorrow I'll take a look at it. I'm of the opinion that that crack is along a flange line and has little to do with water passages.

Looks like the engine was at some time dropped or slammed against something hard and the housing just cracked along the weakest area which would be a flange line (my name for IT).

If so, then a weld seems ok to me. I'd still stop drill the ends of the crack line prior to welding.

jjwalker

I agree with hailers here. Drill small holes at ech end of the crack to stop it from propagating and weld it up. Afterward, check tolerances for warpage.