Hi All

Tested The Intake System For Leaks Today And Discovered Air Coming From The Dipstick Hole. I've Checked The Pcv Valves (which Are New) And The Seem To Be Working Ok.

What Else Could Be Pressurising The Crankcase?

front pcv hoses.

do you mean they are blocked or leaking?

do you mean they are blocked or leaking?

 

they are the ones that are pressurising your crankcase during a boostleak test. (that was your question wasn't it ?)

 

It's not a case of them being blocked or leaking, since there's no valve mechanism in the front hoses they're always open and a boostleak test where you are putting pressure on spots that are normally vacuum will cause these kinds of effects.

 

-Eric

OK i see now

Thanks for the advice.

So when you do a boost leak test is it ok if you have air coming from the crankcase?

would you just ignore the air leak? :confused:

its just that im looking to do one soon and will probably be wondering the same thing myself :smw:

Ta

So when you do a boost leak test is it ok if you have air coming from the crankcase?

would you just ignore the air leak? :confused:

its just that im looking to do one soon and will probably be wondering the same thing myself :smw:

Ta

 

 

In a way it's ok to have a leak there (unless you have disconnected/blocked the front pcv hoses).

If you don't have a leak it proves your crankcase seals and rockercover gaskets have no airleaks, which is nice to know but kind of useless, since that part of the engine doesn't/shouldn't see any positive pressure with the engine running.

 

It's also the reason why you don't put too much pressure on the system when doing a boostleak test, because you run the risk of blowing several oil seals/gaskets out that are not supposed to cope with positive pressure.

CheerZ fella :bow:

What is the max pressure to pressurise to on a boost leak test?5-8psi?

yes, approx. 0.6 bar at most.