How to rebuild a Rochester Quadrajet 4MV carburetor
(Unleaded Fuel vs epoxy) |
(Unleaded Fuel vs epoxy) |
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A common problem on the early Q-jets especially, is leaky main wells. The 'cure' for this has long been to use JB Weld, etc. to seal them over. This is just a stop-gap measure, I have seen personally how the epoxy will degrade over time and quit sealing as it did at first. | A common problem on the early Q-jets especially, is leaky main wells. The 'cure' for this has long been to use JB Weld, etc. to seal them over. This is just a stop-gap measure, I have seen personally how the epoxy will degrade over time and quit sealing as it did at first. | ||
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| − | * <b>2012 Update for New unleaded fuels:<b> | + | * <b>2012 Update for New unleaded fuels:</b> |
| − | After reading many forums about Epoxy degrading I did some research. I found an epoxy by Devcon (made in the USA) - Look for "Devcon Home", it comes in the older 2 x tubes and the newer double plunger type. On the back it clearly states it *RESISTS UNLEADED FUEL*, salt,gasoline, oil etc. Full set time 8-12 hrs/2500 psi. Another product I found was JB water-weld that might work to. Even if you tap/plug the wells, this epoxy will prob serve a better purpose than the general epoxies. | + | After reading many forums about Epoxy degrading I did some research. I found an epoxy by Devcon (made in the USA) - Look for "Devcon Home", it comes in the older 2 x tubes and the newer double plunger type. On the back it clearly states it <u>*RESISTS UNLEADED FUEL*</u>, salt,gasoline, oil etc. Full set time 8-12 hrs/2500 psi. Another product I found was JB water-weld that might work to. Even if you tap/plug the wells, this epoxy will prob serve a better purpose than the general epoxies. |
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If a permanent fix is wanted, the wells can be resealed with new plugs that are peened over to hold them in place, or the wells can be drilled and tapped for short screws that will cure them for good. The primary wells seldom leak, the secondary wells on the early carbs do tend to leak more than the later carbs. | If a permanent fix is wanted, the wells can be resealed with new plugs that are peened over to hold them in place, or the wells can be drilled and tapped for short screws that will cure them for good. The primary wells seldom leak, the secondary wells on the early carbs do tend to leak more than the later carbs. | ||
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