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Post by awdennis on Aug 31, 2010 14:22:05 GMT -5
So I'm pretty sure my oil pump needs to be replaced. Just from what I've read on here.
And i was thinking of getting one from the junkyard. Is there any way at all to test them or things to look for upon visual inspection to know if it will be worth the time and effort to replace it?
Also, does anyone know if you can buy those new?
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Post by Armageddous on Aug 31, 2010 20:37:57 GMT -5
I get them from the dealer, they always stock them here, and they're around $60CDN for inner and outer rotors.
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Post by Deleted on Aug 31, 2010 20:49:40 GMT -5
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Post by awdennis on Sept 1, 2010 0:36:22 GMT -5
Thanks for the replies gents.
Either one of you replaced the inner&outer rotors before?
Or has anyone else?
Is it hard to replace them?
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Post by Deleted on Sept 1, 2010 1:14:22 GMT -5
Is it hard to replace them? It's a piece of cake. Three screws. The prices on these parts have gone up a little since my last purchase, but I would recommend buying a new oil pump cover along with the rotors(the $7 one not the $400 one). I can't remember if it came with a new o-ring though.
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Post by awdennis on Sept 1, 2010 18:41:16 GMT -5
So by replacing the 2 rotors, and the oil pump cover. This will essentially fix the oil pressure issue that so many justys are plagued by?
What was it, like a bearing it there somewhere that isn't properly lubricated or something? I think I remember reading about people grinding little slots in the rotors to move more oil.
Anyways. So by replacing those 3 things that should fix the oil pressure issue? correct?
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Post by indkid87 on Sept 1, 2010 19:57:34 GMT -5
Sorry to break the bad news but, oil pressure issues on the justy can also be caused by worn out main and rod bearings. So try the oil pump first because it's easy but you may need to dig a lot deeper.
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Post by Deleted on Sept 1, 2010 20:58:56 GMT -5
Yeah indkid87 correct. The oil pump is the obvious starting point and the specific "cause" of the oil pressure problem has never really been proven or identified. I think it is simply systemic. Once the little bearing and friction surfaces start to wear, oil pressure starts to go down which then enhances or accelerates wear and it kind of self amplifies. That is why I am a proponent of the rebuild. Most members don't acquire their Justy with an overly maintained engine. Once you rebuild it, then you can make sure it's taken care of. With the I3 design and/or only three pistons to turn the crank I think the small rod bearings may see an inordinate amount of force and/or torque coupled with a small oil capacity, but that is just a musing with no data to back it up.
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Post by awdennis on Sept 2, 2010 12:55:10 GMT -5
Hmm, yeah the only engine I've ever rebuilt is a 250cc 2-stroke Engine Well let me tell you guys this. The car has 120,xxx miles on it. And i believe it sat for a long time because there was a rats nest in the spare tire space and a hornets nest behind the driver mirror. Both of those wouldnt just happen over night. It would take some time for those to show up. So i think this car has just been parked for a good portion of its life. And unfortunately I cant verify any information on the car because the guy i bought it from just bought it to "flip" and didnt know anything about it and didnt care too. Heck he didnt even take the time to notice to was swapped to a 5-speed somewhere along the way. Anyways all that being said. I want to believe the motor is still in good shape, and the oil pump simply needs to be refurbished. And now I feel like a complete idiot, I thought the oil pump was located somewhere on the bottom end of the motor and was accessible by taking off the oil pan. But by looking around on here, it seems like its behind the oil filter? Yes?
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Post by justyjuggler on Sept 2, 2010 15:17:00 GMT -5
behind the oil filter? Yes? Find the oil pump peeking out from behind the crank pulley. Don't feel bad, the pan will eventually come off anyways...
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Post by justyjuggler on Sept 2, 2010 15:22:45 GMT -5
With the I3 design and/or only three pistons to turn the crank I think the small rod bearings may see an inordinate amount of force and/or torque coupled with a small oil capacity, but that is just a musing with no data to back it up. Me thinks the bore/stroke ratio is worth mention here.
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Post by awdennis on Sept 2, 2010 15:30:58 GMT -5
Hmm, I wonder if this is where my oil leak is coming from..... Isnt there a o-ring in there somwhere that fails?
And does anyone have pictures of what it looks like?
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Post by Deleted on Sept 2, 2010 20:10:06 GMT -5
Hmm, I wonder if this is where my oil leak is coming from..... Isnt there a o-ring in there somwhere that fails? Are you referring to the oil pump or another location? There is an o-ring in the oil pump cover and an o-ring between the head and the block, etc,...
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Post by Deleted on Sept 2, 2010 20:12:24 GMT -5
Me thinks the bore/stroke ratio is worth mention here. Then mention it, or are you doing research?
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Post by Armageddous on Sept 2, 2010 21:28:31 GMT -5
I just bought an inner and outer rotor, an o-ring and a oil pump cover (the 3 bolt plate that seals the pump) for less than $55 CDN. The subaru guy recommended the cover saying they have a tendency to warp and leak. I have never seen it, but for $13 I couldn't say no!
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Post by justyjuggler on Sept 3, 2010 9:02:53 GMT -5
Sure, The magnitude of torque depends chiefly upon the force applied and the length of the lever arm. In engine terms this translates to: less force is applied to a rod bearing while producing same torque when the crank 'throw' is greater. The limit here is the linear velocity of the piston, i guess...
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Post by awdennis on Sept 3, 2010 11:20:19 GMT -5
Hmm, I wonder if this is where my oil leak is coming from..... Isnt there a o-ring in there somwhere that fails? Are you referring to the oil pump or another location? Yeah a picture of the oil pump would be great especially a picture of it on the motor. So i can see where it is in relation to other parts. [/quote]There is an o-ring in the oil pump cover and an o-ring between the head and the block, etc,...[/quote] Well I did a little research and it seems that hopefully(fingers crossed) thats where my leak is coming from. Because its on the passengers side of the motor and its only down low, IE not from Cam Seal/Valve cover gasket. And I just purchased both innner/outer rotors, pump cover & gasket. So hopefully this fixes my oil leak. BTW, the total bill was $55 shipped. Not bad for essentially a oil pump rebuild
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Post by Armageddous on Sept 3, 2010 20:28:18 GMT -5
Pretty cheap if it takes care of both oil pressure and leaking issues. In the big scheme of things, just dropping a new pump into an old cover will usually limp it along until the cover wears out.. From my experience anyways. I put a brand new pump in one of my now deceased engines and the oil pressure was good only for a few months. I blame this on the oblong hole that the old pump created in the cover causing premature wear of the rotor tips.. which unfortunately, much like a rotary engine, is how the oil pump creates pressure.
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Post by Deleted on Sept 3, 2010 20:55:23 GMT -5
Yeah a picture of the oil pump would be great especially a picture of it on the motor. So i can see where it is in relation to other parts. Here you can see the small oil pump cover (three bolts) just to the left of the crank
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Post by Armageddous on Sept 3, 2010 21:27:36 GMT -5
I didn't know porn was allowed on this forum! *blush But seriously, very erotic picture.
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