Banjo Bolt Thread Size Vitesse Inlet Manifold

[PatK]

Hi All, I wonder if anyone knows the correct size of the Banjo Bolt that fits the multi way water unit in the end of the intake manifold.?  Mine Banjo bolt was seized and despite all attempts to remove it, finally sheared across where the holes are drilled in it. A friend finally managed to get the remaining bolt out but the alloy manifold threads are now a little damaged so I would now like to run a tap down it, but can't figure out the thread size from the new Banjo Bolt. It has 14 tpi and seems to be approx .806" across the threads. I took the manifold and bolt to my local engine workshop to try and get a Helicoil fitted, but the bloke said that he could not do it as he thought that it was British Pipe Thread. I'm sure that I'm not alone in having had this problem and in an ideal world would prefer to fit a Helicoil to the damaged thread, so if any of you good folks know the Banjo bolt size and the solution I would be most grateful Thanks very much.  Pat

[dougbgt6]

Hi Pat,

We had a query on this only last month! Here it is.

Doug

 

[PatK]

Thanks Doug, breaking the bolt seems par for the course.  The guy that removed mine used a lot of heat, oxy acetylene and a freezing mixture to crack the seizure. It had worked, but the threads need remaking. However Doug, I spotted a New old stock inlet manifold on e bay yesterday and bought it for £40, which I think is a good deal, so my worries about cutting a new thread are over. However I do now have to remove the blanking plug from the base of the old manifold as the new one comes without any fittings. I have just given it to the same guy to get it out and told him not to worry about damaging the manifold, or even melting it! Thanks for the info Doug.   Pat

[dougbgt6]

Pat,

good luck!

Doug

[Robin]

I know this is an old post but I wondered if there was a way of getting the remains of the banjo bolt out without damaging the thread? Would a specialist engineering shop be the way to go and if so can anyone recommend somewhere in Herts/Essex/Beds (once lockdown finishes)?

[Pete Lewis]

i was thinking a junior hacksaw blade and work a cut thro' to enable a break in two halves if the threads get cut  it doesnt matter the banjo washer does the sealing

pete

 

[NonMember]

I think I'd try to (carefully) grind/drill out most (not all!) of the remaining banjo to leave a thin bit of thread, then Pete's hacksaw blade, if required, will have much less work to do. Also, the remnant will be easier to pick out if it's thin enough to flex.

My Vitesse has a rubber hose bypassing the inlet manifold - done by a previous owner - to avoid the issue.

[Robin]

Pete & Rob - thanks for the tip. Will give it a go.