Important! : Rocker Cover Air Pressure?

1. user_27717 Regular Poster Joined: Oct 2008 Billingham, Stockton-on-Tees Posts: 303 Posi Blue VTR

   #1 7th February 2010, 15:37

   Is their an amount of air pressure coming out of the rocker cover when taking the oil cap off?
   
   Will be a big help, cheers
2. liam-o Established Member Joined: Apr 2009 Posts: 1346

   #2 7th February 2010, 15:40

   how do you mean?
   
   when you take the oil cap off and the engine is running you will be able to feel air coming out (normally its pushed through the breather pipe and back into the air intake)
3. user_27717 Regular Poster Joined: Oct 2008 Billingham, Stockton-on-Tees Posts: 303 Posi Blue VTR

   #3 7th February 2010, 15:42

   when you take the oil cap off and the engine is running you will be able to feel air coming out (normally its pushed through the breather pipe and back into the air intake)
   
   yeh thats what i mean, just makin sure that it was suppose to do that cos its being makin a funny noise coming from there
4. liam-o Established Member Joined: Apr 2009 Posts: 1346

   #4 7th February 2010, 18:51

   what sort of noises?
5. Oxas16V Infrequent Poster Joined: Feb 2005 Frankfurt-Germany Posts: 203 Saxo VTS 1.6 16V

   #5 7th February 2010, 19:10

   Go on 04:26 or 05:22 a bit differrent there you will have the sound, pulsating airstream made by the movement of the cams, valves and crank.
   
   http://www.youtube.com/watch?v=bLiWhkOxI40
   
   Robert
6. user_27717 Regular Poster Joined: Oct 2008 Billingham, Stockton-on-Tees Posts: 303 Posi Blue VTR

   #6 7th February 2010, 20:13

   Like a wining noise it's hard to explain lol il check tht vid out when I'm nt on me iPhone cheers mate
7. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #7 8th February 2010, 12:11

   Whining noise possibly water pump or cam belt tensioner pulley or maybe PAS pump getting noisy.
   
   The "air pressure" is mainly blow by gasses leaking past the piston rings - into the sump - back through the breather - in to the rocker cover.
   
   Excessive blow by is sign or worn engine, do you use a lot of oil mate?
8. user_27717 Regular Poster Joined: Oct 2008 Billingham, Stockton-on-Tees Posts: 303 Posi Blue VTR

   #8 16th February 2010, 17:22

   cheers for that, im doing the timing belt and water pump in the next few days so see wat happens there, nah i dont use alot of oil mate