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Post by radioflyer90 on Jul 12, 2008 20:23:36 GMT -8
Hi there! I am a little stumped on the vacuum lines on my dad's '71 Hilux. I have a box on the driver's side fender that appears to control the vacuum to various places. it has five ports on it. The first is relatively large and is not labeled. I have no hose running there now, nor has there ever been as long as I or my dad can remember. Next, are four smaller ports labeled To Retarder Port, To Intake Manifold, To Diaphragm, To Distributor. Each of them has a hose. The Retarder port I have plugged into something on the carburetor. Intake Manifold I think I have correct, and both Diaphragm and Distributor are plugged into something on the distributor. Now that I have totally revealed my ignorance, do I have any of this right? Should there be a hose on the large port? The store brand repair manual has not been much help with this system.
I have thought of junking the vacuum system all together (except the distributor advance) and going to a Weber carburetor since I have to replace the carb anyway. However, the engine has given unbelievable service in its original configuration (minus a few parts that either fell off or we couldn't remember where they went), and I wouldn't mind keeping it that way.
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Post by Carlyn Dinkler on Jul 13, 2008 5:15:19 GMT -8
The following is from book 98043 Emission Control:
If you would rather have a copy of the page, send me your mailing address.
1. The big connector should go to the gas vapor collection tank near the gas tank, but the picture is not clear on this.
2. The Retard port goes to the lower nipple on the carburetor (so you get vacuum when the throttle is closing or closed)
3. The Intake manifold port goes to the intake manifold union nipple below the carburetor.
4. The diaphragm port goes to the throttle positioner on the carburetor
5. The Distributor port goes to the retard port on the distributor (on the half of advance closest to distributor cap)
Other vacuum lines:
6. From upper nipple on carburetor (vacuum when throttle is opening or open) to nipple on the half of vacuum advance away from the cap.
I generally left only 6 working, removed the linkage on the throttle positioner to disable it, and put a ball bearing in 5 to disable it.
I have 8RC parts, 18RC parts & remanufactured engines, and new & remanufactured carburetors in stock.
Carlyn Dinkler cdinkler@bellsouth.net
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Post by radioflyer90 on Jul 13, 2008 14:44:54 GMT -8
So I definitely have some of it wrong. That is very helpful information! I am still wondering about a few things. The gas vapor collection tank has been missing for many years, at least since the '90's when we removed the original tank and installed a larger one from a Buick. Is this an important component? I am guessing not. Also, am I reading you correctly in that all I really need is vacuum to the distributor advance? I did read about the throttle positioner in the manual, and I am pretty sure that this one doesn't work. There is some linkage missing from the back of the carburetor- I never knew what it was for, but I assumed it had something to do with cold idling, since this truck won't. Can I just cap off everything else and call it good? Thanks again for your help!
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Post by Carlyn Dinkler on Jul 14, 2008 2:08:34 GMT -8
The lack of the vapor collection tanks should not be a problem. On the original tank with the vapor collection system, the gas cap was probably a sealed cap with a valve. With the new tank, check to make sure the fuel pump does not cause a vacuum in the tank (if the tank is sealed with no way for air to replace the gas pumped out). Since the tank has been on a long time, this is probably not a problem.
With the vacuum advance line in place & working, cap all the other lines and you are good to go.
I should have the 8/18RC engine parts catalog revised within the next month, and I can send a copy.
Carlyn Dinkler cdinkler@bellsouth.net
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Post by radioflyer90 on Oct 6, 2009 20:26:30 GMT -8
It's been quite a while since I posted the original question, and I finally got around to fiddling with it some more. I started by pulling off all of the vacuum lines (except the brake booster) and capped everything. Then, I bought some new vacuum hose (everything that was there was original) and ran one hose from the distributor advance to the vacuum port on the manifold just below the carburetor. Then I readjusted the timing and it runs almost like new. Thanks for the help!
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Post by snowbalance on Dec 2, 2010 15:44:14 GMT -8
Hi, this information is really helpful. I have an 18r-c engine in a 1973 Chinook. Do you know where the vacuum lines would go on that model? I think this may be the issue. I just bought this vehicle and it will run and drive for about 10 minutes and then will die when I give it gas and is hard to start after that until it sits awhile. Thanks
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hilux
Toyota Novice
Posts: 35
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Post by hilux on Dec 4, 2010 20:33:52 GMT -8
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