Shop diagnosed "Carburator leaking air from throttle shaft"....
June 18th, 2013, 05:30 PM
#2
Administrator
Join Date: Oct 2009
Location: Poteau, Ok
Posts: 41,053
Spray some carb cleaner around your throttle shaft and carb base, if it when the idle smooth's out and increases that's your vacuum leak. Not that this issue does not happen, just some shops tell it to all their consumers.
No a simple gasket change will not correct this.
Here's a good read:
http://www.crankshaftcoalition.com/w...4MV_Carburetor
No a simple gasket change will not correct this.
Here's a good read:
http://www.crankshaftcoalition.com/w...4MV_Carburetor
June 18th, 2013, 05:34 PM
#3
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Join Date: Jun 2013
Posts: 21
Spray some carb cleaner around your throttle shaft and carb base, if it when the idle smooth's out and increases that's your vacuum leak. Not that this issue does not happen, just some shops tell it to all their consumers.
No a simple gasket change will not correct this.
Here's a good read:
http://www.crankshaftcoalition.com/w...4MV_Carburetor
No a simple gasket change will not correct this.
Here's a good read:
http://www.crankshaftcoalition.com/w...4MV_Carburetor
On a semi related topic (not really), what is easier: replacing the intake valve on a cylinder or replacing the rings?
Thanks.
June 18th, 2013, 07:10 PM
#6
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Posts: 21
I had a leak down and compression test done and the result were that my 3rd and 6th cylinders need new intake valves and rings. I wanted to see which one of the two would be more feasible for me to do because doing one of the two would greatly improve the function in those two cylinders.
June 21st, 2013, 10:19 AM
#9
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Posts: 21
So I talked to a Carb guru in my area over the phone and he said before I bring it in to him (or rebuild it for that matter) to replace the base gasket. Thats exactly what I thought to do too!
Any hints on replacing carb gaskets? Sealing issues? etc...
Thanks
Any hints on replacing carb gaskets? Sealing issues? etc...
Thanks
June 21st, 2013, 10:42 AM
#10
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Join Date: Oct 2009
Location: Poteau, Ok
Posts: 41,053
Did spray around the throttle shaft and the base of carb with the engine running to see if in fact you do have a vacuum leak?
To change the base gasket remove carb from manifold. You just need to disconnect enough vacuum lines, linkage, and the fuel line to lift the carb out of the way to remove the old gasket. If it sticks to the bottom of the carb, you may have to disconnect the remaining items to flip it over and scrape it off the base. Also scrape any gasket material sticking to the manifold. I stuff rags in the holes to prevent dirt and scrapings from entering the manifold.
Then place the gasket over the manifold, reinstall carb, and tighten bolts/ nuts from cross corner to cross corner and reinstall, lines and linkage.
To change the base gasket remove carb from manifold. You just need to disconnect enough vacuum lines, linkage, and the fuel line to lift the carb out of the way to remove the old gasket. If it sticks to the bottom of the carb, you may have to disconnect the remaining items to flip it over and scrape it off the base. Also scrape any gasket material sticking to the manifold. I stuff rags in the holes to prevent dirt and scrapings from entering the manifold.
Then place the gasket over the manifold, reinstall carb, and tighten bolts/ nuts from cross corner to cross corner and reinstall, lines and linkage.
June 21st, 2013, 10:59 AM
#11
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Join Date: Jun 2013
Posts: 21
Did spray around the throttle shaft and the base of carb with the engine running to see if in fact you do have a vacuum leak?
To change the base gasket remove carb from manifold. You just need to disconnect enough vacuum lines, linkage, and the fuel line to lift the carb out of the way to remove the old gasket. If it sticks to the bottom of the carb, you may have to disconnect the remaining items to flip it over and scrape it off the base. Also scrape any gasket material sticking to the manifold. I stuff rags in the holes to prevent dirt and scrapings from entering the manifold.
Then place the gasket over the manifold, reinstall carb, and tighten bolts/ nuts from cross corner to cross corner and reinstall, lines and linkage.
To change the base gasket remove carb from manifold. You just need to disconnect enough vacuum lines, linkage, and the fuel line to lift the carb out of the way to remove the old gasket. If it sticks to the bottom of the carb, you may have to disconnect the remaining items to flip it over and scrape it off the base. Also scrape any gasket material sticking to the manifold. I stuff rags in the holes to prevent dirt and scrapings from entering the manifold.
Then place the gasket over the manifold, reinstall carb, and tighten bolts/ nuts from cross corner to cross corner and reinstall, lines and linkage.
June 21st, 2013, 08:41 PM
#13
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Join Date: Jun 2013
Posts: 21
So I am going to need to change my air filter more often? And pour in an etra quart of oil a year? Who cares.
June 23rd, 2013, 02:56 AM
#14
'87 Delta 88 Royale
Join Date: Dec 2010
Location: Margate, England
Posts: 2,514
British Vauxhalls were notorious for this back in the '60s, I dare say other engines might have similar problems.
Sounds like your whole engine is worn, if you remove the pistons you will see how worn the rod bearings are, I suspect you will find plenty of wear.
If that's the case the least expensive long term fix will be giving the engine a complete overhaul.
For your extra trouble you will have more power for less gas and a cleaner engine bay with no unpleasant smoke from the exhaust.
The only trouble is you might find the rest of the drivetrain is worn as well.
Roger.
June 24th, 2013, 12:16 AM
#16
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Another factor to consider is if you do do a valve job and restore the compression you might find the engine bearings are too worn to handle the new load.
British Vauxhalls were notorious for this back in the '60s, I dare say other engines might have similar problems.
Sounds like your whole engine is worn, if you remove the pistons you will see how worn the rod bearings are, I suspect you will find plenty of wear.
If that's the case the least expensive long term fix will be giving the engine a complete overhaul.
For your extra trouble you will have more power for less gas and a cleaner engine bay with no unpleasant smoke from the exhaust.
The only trouble is you might find the rest of the drivetrain is worn as well.
Roger.
British Vauxhalls were notorious for this back in the '60s, I dare say other engines might have similar problems.
Sounds like your whole engine is worn, if you remove the pistons you will see how worn the rod bearings are, I suspect you will find plenty of wear.
If that's the case the least expensive long term fix will be giving the engine a complete overhaul.
For your extra trouble you will have more power for less gas and a cleaner engine bay with no unpleasant smoke from the exhaust.
The only trouble is you might find the rest of the drivetrain is worn as well.
Roger.
June 25th, 2013, 02:15 PM
#19
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Join Date: Jun 2013
Posts: 21
Nothing. I might just sell the car. It runs just fine, starts every time, etc. But I wanted to eventually make it a track car. Its great for everyday use (only 35,700 original miles) but I am not sure I have the time to put into it.
It would be nice for someone who knows what to do with it to take it over.
It would be nice for someone who knows what to do with it to take it over.
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