CantGoStraight

Just a quick question on the metal gaskets used on our engines. I'm putting a used motor in my car and am transferring all the exterior components off my O-ring failed motor to the used motor. Will it be ok to reuse the
the metal gaskets when reassembling this motor ? Second question....does anyone have the plastic deflectors that go into the fuel injector ports on the primary injectors ?? I was going to use mine out of the blown motor but they were so brittle that they broke while trying to remove them. Thanks, Jack

c00lduke

I'm pretty sure one of the biggest point of using the metal gaskets were to make them re-usalbe. I see no problem with it as long as they are in good shape.

duboisr

Garfinkle has the injector deflectors if they have not been sold or used , the ones I saw were new in the packing Call him in Murfreesboro Tn.

RonKMiller

You need to replace ALL the gaskets when you do a rebuild unless the factory manual specifically says you can re-use them. Metal gaskets are one time use only, once they have been compressed they cannot be re-used.

Anything less will compromise the quality of your motor.

es

The metal gaskets can be re-used as long as they are not screwed up.

I have re-used the following gaskets with no problems, if any of them are paper then replace!
Throttle body
UIM
LIM
Exhaust manifold
Downpipe
Turbo manifold
Mid pipe
ACV

RonKMiller

Oh well, I guess the Mazda factory workshop manual is wrong also...but wtf do they know?

Most if not all metal gaskets have a small ridge that runs around the perimeter of the gasket. When you torque the part down you compress the ridge and create the seal. It does not pop back up again. It is designed to be used ONCE. Auto mechanics 101.

Now I know why so many rebuilds croak in 12,000 miles.

j9fd3s

iTrader: (3)

the factory manuals are full of errors, and the orignial gaskets for the were paper that did need to be replaced

mike

Import Convert

I agree. Something like a turbo manifold/DP gasket could be reused but think about head gaskets (I know rotarys have none). Would you reuse a metal head gasket? I sure wouldnt.

es

What's your point? TB, LIM & UIM gaskets see 20PSI at most & NO coolant or oil!

Ron, how is a bad LIM going make your motor croak? It wont!

I'm not saying re-use oil control O-rings or Coolant O-rings (equivilant of head gasket) just the metal gaskets that never see combustion, coolant or pressurized oil!

Easy with the 101 there. I'd like to see you replace the $120 TB gasket every time theres some little turbo control problem when I've re-used mine ~5 times & never has it leaked...

The manual stated to replace gaskets which at the time were paper & really had no buisness being there anyhow!

RonKMiller

I normally don't even respond to such blatantly ignorant responses but I really can't resist since there is SO much bad information on this forum...

"How is a bad LIM (lower intake manifold) gasket going to make your motor croak? It won't!"

How about the FACT that any blown or even minutely leaking intake manifold gasket will make your motor (or any motor) run lean? Could this be a problem?

Think about that for a moment.

Why would you even take a CHANCE by re-using a gasket that is only designed for one time use?



This all goes back to my original post. If you are going to rebuild a motor the PROFESSIONAL way you replace
ALL gaskets. Period. Anything less is pure, unadulterated bullshit - and a potential failure point that can cause $5K worth of time, effort and parts to be rendered into a worthless pile of crap.

Happens all the time. Read the posts.

Saving a few bucks - or even $125 - when rebuilding is just plain stupid, and only a shade tree wannabe "mechanic" would ever suggest such a cheap *** way to do the job properly.

13brv3

Don't hold back, tell us how you really feel

FWIW, I would change every hose, belt, and gasket if I were installing a new engine. On the other hand, I wouldn't replace a throttle body gasket every time I remove it, because I'd have to order them by the case

For the record, on our engines, I don't believe an intake leak would be a catastrophic problem. Our computers sense pressure, and add fuel accordingly. If there's a leak, the pressure changes, and so does the fuel. Also, the only time there's really any danger of blowing an engine is when we're on boost, so it's not likely that we'll be sucking in any extra air from a leak. If you had an antique system, such as a $25k Lycoming, then maybe it would be a problem

Now I think I'll go cower in a corner awaiting your next post

Rusty (shade tree aircraft mechanic)

RonKMiller

Two words: A & P. (ok, it's actually three...)

BTW, have you checked out www.airscooter.com?

I am seriously considering selling all 5 of my motorcycles to buy one. Well, maybe I'll keep the
Bimmer.

Rumored sales price: $25K, although they will only say
"under $50K". I don't really care. The engine is nothing short of incredible.

13brv3

Interesting craft, but I've seen too many of these neat ideas that never really made it to market, or faded away quickly (after killing off a few of the early customers). Call me chicken, but I think I'll wait until there are a couple hundred flying

Cheers,