pressurizing crankcase for leaks

[beanski]

i just finished put my engine together.i dont have a pressurizing kit so i made plates with rubber gaskets to block off rave valves, intake,and exhaust ports. borrowing a pump from work..where should i apply air, i can put a nipple in any plate and thread it in? should i do each side of crank case (each cylinder). how much pressure is recommended? i remember doing this to a snow mobile engine but it has been a long time ago. just starting to have fun again ..yee ha (787 rotax ) i looked in my manual but i dont see any thing about this unless it hidden some where i did not read. any way a little more help would be appreciated .
thanks again.

 

[kustomkarl]

Why would you feel you need to do a pressure test on a newly rebuilt engine? Fire it up...
Doing a pressure test is for finding problems...not on a newly rebuilt engine.

Karl

 

[6KJR]

I would figure its a good idea to pressure test a new engine and an older engine. Better to see if its good while its out then to run into something after. Perhaps someone missed a gasket or seal?

 

[spunkyone]

test

RIGHT ON THEN WHY WOULD SBT ANY OTHERS TELL YOU THEY HAVE BEEN PRESSURE TESTED UPON REBUILD?? I THINK ITS LOT EASIER TO CHECK NOW THEN HAVE IT IN THE MACHINE:agree::cheers::biggrinjester::grouphug::lurk:

 

[beanski]

crank case pressurizing

i want to pressure test the engine because i rebuilt it. i built some snowmobile engines a couple of times before and guess what? the only time i didnt pressure test it ,it BLEW UP.the crank seal was leaking due to minor damage that you could bearly notice on the journal of the crank.. first time doing a seadoo engine and i dont want to waste my money for something simple..

 

[nswillin]

Hey Bean. Seadoo makes a leak testing kit. I've personally never used it but it will test top end bottom end as as the cooling system. You can rent the kit at this link.



There is a high deposit but only 60$ for the actual rental of the kit. May be worth a shot. :cheers:

Ryan

 

[blaster52]

Question Not Answered

It appears from this thread that beanski's question was not answered....I don't know if there is a source where you could get a step by step instruction. Did not find one in this forum. Maybe just not looking in the right area. Someone help us all!!

 

[kustomkarl]

There is plenty of help in a step by step form in the seadoo manuals. I noticed that beanski isn't a "Premium Member", so he won't have access to many steps involved unless he signs up for a month. The pressure test is in just about all the seadoo manuals we have in the seadoo forum library. If it was just a couple paragraphs I would retype it here...but I'm not gonna write a novel here in the form, you'll need to see if for yourself. The only time in my 33 + years of buildings engines that I pressured tested an engine was to find a problem. Even the high dollar engines in my race boats were spot on every time... I guess that comes with experience and knowledge. I have a vast knowledge being certified by Kawasaki and Honda. If your in doubt, then the pressure test will give you confidence on your build. Let us know how you make out.

Karl

 

[seadoosnipe]

Air Test.....?

There is an engine air test in your manual. It's located in the chapter "engine". The test is a 3 part test. Starting with the cooling system then the bottom and top end and lastly the rotary valve shaft.

Testing the cylinders is done as one test because the pistons share a common head, they can not be tested individually.

Because of the complexity of the test, it would take me way to long to try and type it in the forum. If you have the manual, it should be in there. Sorry, I too cannot answer this question although I did read the chapter. I could summarize it for you but that would really serve no purpose as you are looking for specific parameters. :cheers:

 

[beanski]

thanks for all your answers .i do have an original manual.iwill read through again.i didnt see it ,but i will find it if its in there.
thanks alot
randy

 

[kustomkarl]

Some after market manuals won't have the detail you need to perform the tests... If you are still stumped give us a shout...and we'll try to help and send you in the right direction.

Karl

 

[nswillin]

Also if you rent the kit it will come with instruction on how to use it.

 

[beanski]

.i got it found everything i needed and built my own pressurizing kit at work yesterday.. holding pressure properly in all tests .thanks for everyones in put.no guarantees but bit more confident especialy when i dont do any of this very often.

 

[seadoosnipe]

Pressures....

Well, it seems you don't need the specific procedures for testing. You've hooked up properly for the block test. I did look in the 96 model manual and couldn't find them myself. But in the 97 manual and just about all the others, the test is there.

To help you out a little, since I don't have to type the entire procedure, your engine cooling system, block and rotary chamber should be tested to a pressure of 5 psi, held for 3 minutes.

Although it doesn't look like you need much help, I thought I'd look up the pressures for you. Because the rotary chamber is sealed from the block, there is a test just for it. I see you have it blocked off for your engine block test. I'd remove those plates on the rotary chamber and test the block to make sure you have a good seal between the rotary shaft seals. Then, test the rotary chamber on by itself for 3 minutes at 5 psi too.........cheers:

 

[beanski]

:cheers:thanks for checking the pressure specs.i didnt want to mention it but i took a guess at the pressure ,but i did end up using 5psi lucky guess. i did remove the plates before i made the last post and tested the rotary shaft compartment .it also held 5psi. both for 20 minutes so should be ok for that . i know its not a rocket ship, but im just trying to be as fussy as i can so it will be reliable as possible when getting out for a cruise. i looked again in my 96 manual and i still couldnt find the test.thanks again for checking the next year manual.
probably stick it in the hull next week when i find time. probably be just a garden hose start up for this year.

later

 

[seadoosnipe]

Fussy or smart?

I don't know if I'd call it fussy. I think I'd call it added protection. Most trust the testing done at a remanufacturer shop but they can be faulty too.....so, to get a second opionion so to speak, is a good idea. I'm glad to see the engine checked out o.k..........then again who could you blame if it didn't? You?...........:rofl:

I'd say it was a pretty good job. Want to rebuild mine for me?......:cheers: