CU Back firing help

Post by **Uberpussy** » 22 Jun 2008, 21:19

Mocki wrote:where to get a CU dissy......... ummm....... erm........ post a wanted add in the wanted forum....... some of the breakers on here might have one, Billy739, T25 Spares...........arghhhhh , ummm........ try the JK kamperchat forum, and VZI too......

Thanks man, I owe you a beer or three

Post by **Rozzo** » 23 Jun 2008, 06:22

mine runs ok on a 009 with the power of sparkrite

Post by **Ye Olde Syncrospares** » 23 Jun 2008, 08:11

it might run ok but your not getting the full amount as a 009 dizzy has a built in retard for number 3 so number 3 cylinder isnt getting as much spark as ther rest because its a type 1 engine part not a type 4 engine part,cj.

Post by **Laurie** » 23 Jun 2008, 09:01

The Distributor isn't that much of a problem.
If you are able to time it, and get a decent advance, it'll work.
Many people run points on the CU because they had probs with the electronic, usually caused by the idle stabilizer which has helped kill many engines of the unwary and uneducated.
If it has been built as a CU, has it also been rebuilt with hydraulic tappets?
Until they fill, if the engine has been recently rebuilt it will backfire and bugger about. A quick test is to drop a rocker cover and see if you can get any of the tappets to pull away from the valve.
The other thing to look at, if it is hydraulic, and it is dead common.
People don't understand the difference between sprung and unsprung clearance when setting the valves. So, Get the cylinder you want to check up to TDC. Back the tappet off until there is a clear, unspringy gap between the valve and tappet. You may be able to pull the rocker back further, but that is sprung clearance, you are looking for free movement.
Tighten the tappet to remove free movement then 1 and 1/2 turns in.
I've see npeople remove all the sprung clearance and when the tappet fills, the valves are hitting the pistons!
All water boxers were electronic, in fact, all T25s were. (except the diesels for the clever b's amongst you

New rocker gaskets!
Rocker cover trick..... Loop a cloth around the clip on the T4 engine. Hold the cover on and pull like buggery. You should get the clp up without disturbing the gasket.