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metropoj
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Joined: April 23, 2004
Posts: 1343
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 Posted: Wed Aug 21, 2013 4:30 am Post subject: Bench Pressure Testing a 2.1 for water leaks. |
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Got a used motor, the waterjackets still feel quite pliable, no signs of leakage but sitting for a while.
I am on again off again for stripping the whole thing down to replacing all the water jacket and piston o rings etc if it tests OK ...
Leak down test was very good at 2-3% but I don't think that fully tests the rest.
Anyone done this and offer any words of wisdom ? Thanks in advance .... |
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ftp2leta
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Joined: October 11, 2004
Posts: 3271
Location: Montreal
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metropoj
Samba Member
Joined: April 23, 2004
Posts: 1343
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| Posted: Wed Aug 21, 2013 5:46 am Post subject: Re: Bench Pressure Testing a 2.1 for water leaks. |
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| ftp2leta wrote: |
| metropoj wrote: |
| the waterjackets still feel quite pliable----------- replacing all the water jacke.... |
Do you know what your doing? |
One of the checks I read on the forum is to see if the water jacket seals themselves are rock hard on the outside and that kinda gives you a rough determination if there is any hope at all that they are maybe OK....
So, educate me if there is any way to pressure test the engine as asked in the thread..... |
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ftp2leta
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Joined: October 11, 2004
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Location: Montreal
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metropoj
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Joined: April 23, 2004
Posts: 1343
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| Posted: Wed Aug 21, 2013 6:00 am Post subject: Excellent info, thanks. |
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Since the motor wasn't in a van hooked up to test with a full cooling system I was wondering if anyone plugged and tested on the bench the motor itself .....
maybe I'll just try and hook up as many pipes together to create a seal and give it a shot !  ... |
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insyncro
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Joined: March 07, 2002
Posts: 15086
Location: New York
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| Posted: Wed Aug 21, 2013 6:58 am Post subject: |
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Just reseal it.
It could use the love anyway. |
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metropoj
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Joined: April 23, 2004
Posts: 1343
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| Posted: Wed Aug 21, 2013 7:02 am Post subject: |
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| insyncro wrote: |
Just reseal it.
It could use the love anyway. |
Sigh, alas you are right .... may as well get totally intimate with her than to just tease her a little bit ... 
I'll follow along the threads on these and bens work and get that DJ back on the road instead of on the stand ..... |
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metropoj
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Joined: April 23, 2004
Posts: 1343
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| Posted: Mon Aug 26, 2013 5:26 am Post subject: |
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| insyncro wrote: |
Just reseal it.
It could use the love anyway. |
And precisely why digging deep is the only real answer ... only then do you get the real story, right ?
Check this mess out ...
Coolant jacket almost completely dissolved inside, crystallized coolant is my guess everywhere else, cracks between the valves and pitting everywhere. And, haha, I should have beaten those heads a little more aggressively like Ben did on his movies to loosen up the sleeves. I ended up pulling one too far out upon exit, no big deal since I'm doing a complete reseal anyways I'll pop the rings back on..
Id be fooling myself that these heads (although tested excellent as part of my leak down test) are 'limited' service but at most i put 5,000 kms a year on it I may try and use them for a bit to see what happens, maybe I'll get a few years outta them. I am close to doing an Inline-4 oldskool conversion since i got all the parts so I don't want to be too deep into this DJ to bother replacing the heads .....
am I nuts trying to get some service out of these puppies ? The DJ high compression on our gas may accelerate their demise however ... Almost an interesting experiment !
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ftp2leta
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Joined: October 11, 2004
Posts: 3271
Location: Montreal
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metropoj
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Joined: April 23, 2004
Posts: 1343
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| Posted: Mon Aug 26, 2013 7:33 am Post subject: |
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| ftp2leta wrote: |
| You will have to inquire how deep is the crack. Clean everything deeply. |
Ugh, does this mean removing the seats out to inspect or at least pulling the valves and see if the crack shows under the seats ? |
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ftp2leta
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Joined: October 11, 2004
Posts: 3271
Location: Montreal
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| Posted: Mon Aug 26, 2013 9:15 am Post subject: |
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well, not the seat The water cooled engine don't have the seat problem like the air-cool engine had.
It would be intelligent to have a deeper look by just removing the valve
You can easily built your own valve remover with a big C adjustable clamp (I'm not sure how it's called in English).
At 80% the crack is not deep but once in a wile they pass the seat and that is not good
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metropoj
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Joined: April 23, 2004
Posts: 1343
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| Posted: Mon Aug 26, 2013 9:27 am Post subject: I see ... |
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| OK, I see what you mean now thanks for your tips. I'll remove the valves and take a peek inside and hope for the best. I have friends with tools if I can't find my old skool valve spring compressor ... |
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metropoj
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Joined: April 23, 2004
Posts: 1343
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| Posted: Thu Aug 29, 2013 8:29 am Post subject: Past the seat .... :( ... |
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One of the heads saw a crack past the seat in the exhaust port  Nuts.
So, I think that's it for me on this motor. Too much to put into it for very little out.
I am going to pull one of the Rods however to see if this DJ had stretch bolts in it or not. I saw others asking the question.
At least the pistons etc seem good so I'll sell them ....
Plan B is my Inline 4 old Skool Diesel ABA / 8V head 50 Deg & Digi II.
I'll ride out my 86 2.1 MV for as long as i can until I-4 is ready .... |
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