Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

press test hg before install?? 2.2l


  • Please log in to reply
5 replies to this topic

#1 aa8jzdial

aa8jzdial

    USMB Regular

  • Members
  • PipPipPip
  • 114 posts
  • muskegon michigan

Posted 28 December 2005 - 10:10 AM

Being a back yard, shade tree wrencher, way in back yard and under big tree,
was wondering about pressure testing block by closing off thermostat outlet, pressurizing upper radiator hose and watching bleed down before reinstalling motor in car.
I have had an instance where put new heads and gaskets on my 1990 ej22 and found water spitting out exhuast and bubbling in radiator. Can this be used as a quick test to verify integrity of the repair??
Be nice to find out before going through all the labor of putting motor back in.
Pressurize to about 10-15 psi?? Should hold pressure indefinately, right?
Bad idea?
tnx
rick
w. mi

#2 OB99W

OB99W

    Elite Master of the Subaru

  • Members
  • 3,315 posts
  • Ithaca

Posted 28 December 2005 - 10:35 AM

Pressurize to about 10-15 psi?? Should hold pressure indefinately, right? Bad idea?

It might be a useful test. Certainly if it bleeds down, assuming your t-stat outlet plugging and hose connections are tight, you've got a problem. However, keep in mind that cylinder pressure is about 10 times coolant pressure, and coming from the opposite direction, so this wouldn't be totally conclusive.

#3 All_talk

All_talk

    1000+ Super USER!

  • Members
  • 1,093 posts
  • Thorp (Ellensburg)

Posted 28 December 2005 - 10:37 AM

You could do it but I dont think it will tell you all that much. Conditions in a cold bench test wont even be close to a running, up to temp engine. Sure it could show you a major issue, but wont prove the integrity of the seal under normal conditions.

Gary

#4 All_talk

All_talk

    1000+ Super USER!

  • Members
  • 1,093 posts
  • Thorp (Ellensburg)

Posted 28 December 2005 - 10:43 AM

...keep in mind that cylinder pressure is about 10 times coolant pressure...


And thats just rotating static pressure, actually firing pressures are about 1000 times the coolant pressure.

Gary

#5 aa8jzdial

aa8jzdial

    USMB Regular

  • Members
  • PipPipPip
  • 114 posts
  • muskegon michigan

Posted 28 December 2005 - 10:50 AM

tnx guys for the input.
Not sure now if it is worth the bother considering I would need to machine up some fittings and valves.
I guess if it was real valid it would be common practice.
rick
w mi.

#6 OB99W

OB99W

    Elite Master of the Subaru

  • Members
  • 3,315 posts
  • Ithaca

Posted 28 December 2005 - 11:48 AM

And thats just rotating static pressure, actually firing pressures are about 1000 times the coolant pressure.

Good point; I guess I was thinking in terms of compression and doing a cylinder leakdown test, but even that might be difficult on a rebuild that hadn't been run in yet.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users