The double SU HS6 carburetters were covered in a mix of grease, oil and mud. As I bought the car with the engine in bits I didn't know in what condition they were and decided to clean them thoroughly, dismantle them and do some rebuilding.
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SU HS6 carburetters AUD331 after 13 years collecting dust |
The rebuild kit you need for these SU HS6 carburetters is CRK 249. This kit doesn't come with the jet needles as they vary depending on the engine and carburetter number. The labels on the carbs indicated AUD331, so according to a needle chart I needed spring-loaded needles with code AUD1538 KN.
When replacing the needle make sure the needle guide is flush with the piston and that the mark on the guide points away from the ports in the piston. The jet assembly is hold by one screw and one bolt which connect the float chamber with the feed pipe.
With most SU carburetters you need to centre the jet after replacing the needle and/or jet. But with this one it's not possible and thus not neccessary.
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Spring-loaded KN needle and jet close up |
I also replaced the needle valve and seat in the float chamber and checked the float level (ca. 4.8 mm).
Another thing to check is the damper piston clearance. Don't be fooled by the Haynes manual, the right clearance for the AUD331 carbs should be 0.4-0.8 mm.
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float chamber SU HS6 carburettor disassembled |
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Old (left) and new needle float chamber |
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Messuring the float level SU HS6 carburetter |
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Messuring the damper piston clearance (0.4-0.8 mm)
SU HS6 AUD331 carburetter |
After reassembling the carbs they need tuning. But in order to tune them you need a running engine... Hmmm.. back in the box for now.
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Rebuild SU HS6 AUD331 carburetters |
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Rebuild SU HS6 AUD331 carburetters, they only need some tuning |
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Carburetters mounted on manifold |
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Carburetters mounted on inlet/outlet manifold |
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