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ET: Engine (Twin) Rear 289 Float Bowl Top

bmetcalf

Well Known and Active Website User
VOC Member
The threads on the float bowl top seem to be worn out. When I tighten it up, it seems OK, but then when I tighten the banjo nut, it pops loose. Functionally that isn't too bad, but I would rather have it work as designed. The banjo just misses the tickler button, so that isn't the issue. My first reaction is to replace the float bowl and top, but that is a fair amount of money. How likely is it that just a new top and a PR6AQ washer would cure this ill? The threads all look fine now, so there isn't an obvious choice between a new bowl or top.
 

nigsey

Well Known and Active Website User
VOC Member
It’s obviously not gripping on the threads, so guess they are worn. Is it possible to use a thinner fibre washer on either side so the bolt/nut goes a little further in, thus gripping fresh thread lower down? If so, you need to make sure you you don’t over tighten, just nipped up. Alternatively, you could try packing out the thread on the bolt/nut with petrol/gas resistant tape. I’ve heard that plumber’s tape, known as PTFE tape here in the Uk is suitable for for fuel line threads.
 

Bill Thomas

Well Known and Active Website User
VOC Member
The threads on the float bowl top seem to be worn out. When I tighten it up, it seems OK, but then when I tighten the banjo nut, it pops loose. Functionally that isn't too bad, but I would rather have it work as designed. The banjo just misses the tickler button, so that isn't the issue. My first reaction is to replace the float bowl and top, but that is a fair amount of money. How likely is it that just a new top and a PR6AQ washer would cure this ill? The threads all look fine now, so there isn't an obvious choice between a new bowl or top.
Plumber's tape PTFE we call it in UK, Might be worth a try
 

Trickymicky

Active Website User
VOC Member
You could try the top from the front carb in the rear float bowl and see if it tightens ok. If it does, a new top should cure it. Amal's idea of a replacement top feed float chamber top though, is actually a modified bottom feed (front carb) top, and they look different to the originals. You could also run in to problems with the float level, as i found out doing the reverse - fitting an original top feed top to new carbs.
 

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