Bongo Fury

click on this link...

http://www.youtube.com/watch?v=yCwUV2sTQGI

Cheers,
Dave
ProGroup Network Solutions,
British Columbia, Canada

email [email protected]

Excellent stuff Dave
Would have been a whole lot better if it had worked properly.

Look forward to you next one.

great vid.
just trying to think of the cause/s of the damage/fault.
if ive read your other posts correct, this was supplied built up wasnt it.? if it was you would have thought the builder would have set the clearences,and checked that everything was ok,and that everything rotated fine.

edit.
the cam shaft isnt loose on its mounts is it ?.

I had the same or similar problem when my head was replaced 2 years ago. I drove for about 200 miles and a loud bang and sounded like a bag of bolts in the engine. Garage that did the head fixed it all for me FOC and explained that one end of the rocker sits on a ball joint type of doodaa and this is replaceable. the replaceable part came loose and unscrewed itself leaving no clearance for the rocker. This led to the cam coming down and breaking the rocker in two. I asked if this would have affected the valve or the piston top and he assured me that it was ok.

thedogsbollox wrote:I had the same or similar problem when my head was replaced 2 years ago. I drove for about 200 miles and a loud bang and sounded like a bag of bolts in the engine. Garage that did the head fixed it all for me FOC and explained that one end of the rocker sits on a ball joint type of doodaa and this is replaceable. the replaceable part came loose and unscrewed itself leaving no clearance for the rocker. This led to the cam coming down and breaking the rocker in two. I asked if this would have affected the valve or the piston top and he assured me that it was ok.

This IS similar; but in my case I first discovered the rocker had slipped off and laying loose out of the way of the cam lobe. When I further discovered that ALL the rockers were loose or not properly adjusted; I proceeded to readjust each in sequence as 1/4 turn back from snug or about .010 thousandth/inch [.025mm].

The second time the rocker broke!! I believe what has happened is that the first time may have bent the exhaust valve.

Dave

widdowson2008 wrote:Excellent stuff Dave
Would have been a whole lot better if it had worked properly.

Look forward to you next one.

Coming tonight or Wednesday morning for you folks!

Northern Bongolow wrote:great vid.
just trying to think of the cause/s of the damage/fault.
if ive read your other posts correct, this was supplied built up wasnt it.? if it was you would have thought the builder would have set the clearences,and checked that everything was ok,and that everything rotated fine.

edit.
the cam shaft isnt loose on its mounts is it ?.

No, the cam is solid!
The builder's distributor in London [these are built in New Zealand apparently], told me that the factory pre-adjusts the rockers to proper specs. I asked this question before I bought from them. I should have been more prudent and checked them myself. I would also advise going a step further and depress each valve spring fully to insure that the valve travels freely and no binding. The cam lobe opens it most of the way but you can't 'feel' the resistence by merely rotating the cam.

Cheers,
Dave

Here is the link to ONLY a small portion we videod!

http://www.youtube.com/watch?v=yCwUV2sTQGI

This is ONLY 1 of many videos I will supply. We filmed another 40 minutes of stuff I havent edited

My mechanic removed all the little jobbies and threadlocked them back in. So far so good

thedogsbollox wrote:My mechanic removed all the little jobbies and threadlocked them back in. So far so good

That's a spot on idea for sure! I think I'll borrow that idea as simple 'insurance protection'.

Dave - this is great. More please!!

Hi dave
Having just myself fitted a new cylinderhead I,ve noticed you quoted 10 thou for valve clearances. using infomation on this forum I have set intake valves at 4 thou or 0.10mm and exhaust at 8 thou or 0.20mm.
When i purchased my fully built up head I found all the valve clearances miles out with the rocker locking nuts not very tight so i decided to strip it down double checking everything.
hope you get it sorted soon.

paul.


This IS similar; but in my case I first discovered the rocker had slipped off and laying loose out of the way of the cam lobe. When I further discovered that ALL the rockers were loose or not properly adjusted; I proceeded to readjust each in sequence as 1/4 turn back from snug or about .010 thousandth/inch [.025mm].

The second time the rocker broke!! I believe what has happened is that the first time may have bent the exhaust valve.

Dave[/quote]

progroup wrote:Here is the link to ONLY a small portion we videod!

http://www.youtube.com/watch?v=yCwUV2sTQGI

This is ONLY 1 of many videos I will supply. We filmed another 40 minutes of stuff I havent edited

Next please

bikerider wrote:Hi dave
Having just myself fitted a new cylinderhead I,ve noticed you quoted 10 thou for valve clearances. using infomation on this forum I have set intake valves at 4 thou or 0.10mm and exhaust at 8 thou or 0.20mm.
When i purchased my fully built up head I found all the valve clearances miles out with the rocker locking nuts not very tight so i decided to strip it down double checking everything.
hope you get it sorted soon.

paul.


This IS similar; but in my case I first discovered the rocker had slipped off and laying loose out of the way of the cam lobe. When I further discovered that ALL the rockers were loose or not properly adjusted; I proceeded to readjust each in sequence as 1/4 turn back from snug or about .010 thousandth/inch [.025mm].

The second time the rocker broke!! I believe what has happened is that the first time may have bent the exhaust valve.

Dave

[/quote]

Oops! Paul; I meant .25~.30 mm or about 10 to 12 thou.!

YouTube Session #2 dealing with the defective new head

http://www.youtube.com/watch?v=r433VRplMdI

Cheers,
Dave