i have found when attempting the conversion that there is a hole in the bottom due to a rust spot, that was not visible until i began cleaning it. Will this hole negate my vacuum?
How in the world did you get that snap ring off down deep in the hole of the cylinder?
edit: since the booster is in vacuum (it is in vacuum no?) couldn't i repair the hole by cleaning well with a wire brush and sandpaper and solvent, and then use JB weld? The vacuum will be sucking in the repair, not pushing it out. ;-)
Jon, I did mention to look for the nicest, cleanest booster that you could. And this is exactly the reason why. We cannot have any leaks in the booster or else it will not work as intended.
A quick run down on booster operation. The purpose of a brake assist unit is to decrease brake pedal effort without decreasing braking forces. This assist allows for less pedal travel and drastically reduces driver fatigue when operating. The vacuum brake assist uses engine vacuum and controlled atmospheric pressure to apply mechanical force to the primary master cylinder piston.
1) In the "released position", we're in a vacuum suspended mode. The vacuum port is open, the atmospheric port is closed and the return spring keeps the booster in the home position. 2) In the "applied position", the vacuum port is closed, and the atmospheric port opens. This happens only when the pedal is moving downward. 3) In the "holding position", the vacuum port and the atmospheric ports are both closed.
When the brakes are released, the booster returns to a suspended mode. To get there, the following happens. -Foot pedal pressure is released. -Vacuum port opens. -The atmospheric port stays closed. -Engine ingests the filtered air from the rear chamber. -Return spring pushes the booster to the home position.
With where your hole is, you'll be losing vacuum and allowing in unfiltered atmospheric air. Both of which are not good. Remember, there are huge forces in the booster.
Take the rear shell to someone with a welder and weld the hole shut or find a better booster.
As for the circlip, I have a decent set of snap ring pliers. If you choose to use an awl or pick to dislodge the clip, there's a good chance that you'll deform the clip. You should always replace circlips, they almost always deform to some extent.
[This message has been edited by Lunatic (edited 10-12-2018).]
I'll admit, I haven't really worked on this project in a while. Let me explain why.
I woke up one morning feeling kind of blah. I was kind of upset with my current career, and despite all my accomplishments, I didn't have anything to show for. I decided to change career paths and went back to college. I took the "automotive service technician" course. They say 6,500 hours and three to four years from start to finish. Not in my case.
The college offers exemption tests. If you get over 70%, you bypass that level and they put you into the next level. This essentially removes one semester of school. So I took the level one test and passed. Great! Now I moved up one level. A little time later, I then took the level two exemption test. Again, I passed with a mark over the required 70%. The kicker is, I had to take the last semester of in-school training as there was only two exemption tests for my trade. However, if I had worked in the field, and 6,550 verifiable hours, then I could just write the final test and receive my certificate of qualification (license).
So the one and only semester of schooling had come and gone. As you can imagine, I had nowhere near the required 6,500 hours. Since I had the experience already, all that was required was a decent, well written, letter of recommendation from my employer. They wrote my letter and we filled out my log book. All that was left was to take the final exam. Earlier this year, I took the final exam and passed. I'm now a licensed auto technician and have some certificates on my wall showing my progress. Woo hoo!
Back to the Fiero. I removed the cover and dusted off the car. I then installed the rear wheels and lowered it back to the ground. This is the first time since I brought the car home that it's sitting on all four tires. It sits a little too high in the front end so it looks like I'll have to cut off another half coil and see how I like it. From there, I'll take the car to the shop and do an alignment. I'm also going to speak to my friend as he owns a body and paint shop. If all goes well, I'd like to drop the car off there and he can have it over the winter. So close yet still so far.
[This message has been edited by Lunatic (edited 11-10-2019).]
would you at all be interested in sharing some of your drawing? the shifter base and trunk floor would be pretty handy for my car.
------------------ "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
I drove the car out of the garage under its own power. Woo hoo!
This car was towed home on a dolly and pushed into the garage several years ago. It has now emerged as a running, driving entity. Albeit an ugly duckling in its current state. I feel good about the car and I now have a desire to continue on and actually finish it. It will need an alignment, body and paint and finishing. My friend owns and runs his own body shop. I'm hoping that I can leave the car at his shop over the winter and he can pick away at it.