dead oil pump - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 12-09-2007, 02:39 PM   #1
Elite Member
Thread Starter
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default dead oil pump

so... my damned oil pump died on me this morning. I changed the oil (ran cheap stuff for 2 weeks to "flush the system" after install), and after changing the oil no pressure.

To make sure it wasn't just the gauge I pulled the feed line off the turbo and cranked it over... let it run for 1-2 sec and no oil came out. So, it's definitely my pump.

I bought a melling replacement. Anyone have experience with these? I've liked a lot of their other aftermarket stuff, but the oil pump is a bit more critical than your average part.

Also, the engine had all of it's gaskets,water lines, and mounts (mazda comp) replaced last year when I swapped it for a fresher engine. Anything else you folks can think of I should change while the motor is out? I haven't got the cash for a rebuild right now and it shouldn't need it since it only ran for a very short period at 800 rpm without oil. I'd say it saw a max of 30 seconds. Not great for longevity, but it shouldn't have hurt too bad in the short term.
Arkmage is offline   Reply With Quote
Old 12-09-2007, 04:13 PM   #2
Elite Member
iTrader: (11)
 
Trent's Avatar
 
Join Date: Feb 2006
Location: Louisiana
Posts: 1,625
Total Cats: 5
Default

maybe a water pump depending on the mileage.
Trent is offline   Reply With Quote
Old 12-09-2007, 04:16 PM   #3
Senior Member
iTrader: (4)
 
Join Date: May 2007
Location: Ontario
Posts: 790
Total Cats: 0
Default

So what did mazda change on the 97's that the oil pumps die?

Every single thread I see with a dead oil pump is pretty much a 97.
reddroptop is offline   Reply With Quote
Old 12-09-2007, 04:20 PM   #4
Elite Member
iTrader: (5)
 
Join Date: Oct 2007
Location: Canton, Ga
Posts: 1,707
Total Cats: 19
Default

yep. seems like a high precentage of oil pump failures "happen" to be 97's. there are a few threads on gheymiata.net about it.
Stealth97 is offline   Reply With Quote
Old 12-09-2007, 04:36 PM   #5
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

I'm guessing the relief valve is stuck open. When you cranked it, a piece of trash got stuck in it and it's dumping all the oil it pumps, not making any pressure. I would doubt the gears actually broke, and if they did, I would think you would have heard it happen.

This is my own idea and may not work, but you could try it. If it is the valve, perhaps you could apply pressure to the engines oil system to maybe 'pop' that stuck valve free. Use an airgun hooked up to a compressore and shoot say 60-100 psi or even more into the oil feeldline that normally goes to the turbo. Perhaps you could get that vavle to unstick. Maybe pour thick oil into the feed line and then use lots of pressure.

That's assuming the valve is the problem though. I don't know, but I would guess it is especially if the failure happened after changing the oil.

EDIT: If it is a stuck valve, sometimes just letting it sit a few days the valve will pop back and not be stuck anymore. If you suspect it's the valve, let the car sit a few days, maybe lube it using oil and an air gun through your oil line that feeds the turbo, and try cranking it a week from now and see if it goes back to working.

Last edited by patsmx5; 12-09-2007 at 04:58 PM.
patsmx5 is offline   Reply With Quote
Old 12-09-2007, 05:18 PM   #6
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

Our relief valves are notoriusly weak man for sure, if i where you i would pull it and swap in the new pump it is good insurance if nothing else the old pump can be a home for some billet gears in the future
magnamx-5 is offline   Reply With Quote
Old 12-09-2007, 05:35 PM   #7
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

you said your damaged oil pump died....
how was it damaged? why did you think the damaged oil pump would work?
Zabac is offline   Reply With Quote
Old 12-09-2007, 06:15 PM   #8
Junior Member
iTrader: (1)
 
Join Date: Nov 2006
Location: Hartville, OH
Posts: 174
Total Cats: 0
Default

my 97 oil pump quit this past summer. pressure relief valve suck open.

melling pump would not work on my car, because it was not machined for the crank sensor, which 97s have. 99 and newer should be same as a 97 pump.

i did not pull motor, probably would've been easier to change if i did.

i used a pump by Rock. seemed better than melling.
left field is offline   Reply With Quote
Old 12-09-2007, 09:20 PM   #9
Elite Member
Thread Starter
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

PATSMX5: I'm positive that the relief is stuck, but I'm not interested in trying to unstick it. If I do it may fail again while cruising on the highway which will take out my engine.

whaaamx5: I said my DAMNED pump failed... not my damaged pump

Left Field: I appreciate that note. I'll take a close look at the pump before I bring it home to make sure it has the sensor mount.
Arkmage is offline   Reply With Quote
Old 12-10-2007, 02:59 PM   #10
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

****, my bad, i promise i know how to read, lol
Zabac is offline   Reply With Quote
Old 12-10-2007, 08:41 PM   #11
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

Quote:
Originally Posted by left field View Post
my 97 oil pump quit this past summer. pressure relief valve suck open.

melling pump would not work on my car, because it was not machined for the crank sensor, which 97s have. 99 and newer should be same as a 97 pump.

i did not pull motor, probably would've been easier to change if i did.

i used a pump by Rock. seemed better than melling.
How did you drop the pan to change the pump with the motor in the car? On my car and every other BP, B6 i have taken apart the oil pump can only be removed once the pan is lowered a good bit.
magnamx-5 is offline   Reply With Quote
Old 12-10-2007, 09:15 PM   #12
Elite Member
Thread Starter
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

Quote:
Originally Posted by magnamx-5 View Post
How did you drop the pan to change the pump with the motor in the car? On my car and every other BP, B6 i have taken apart the oil pump can only be removed once the pan is lowered a good bit.
this is a moot point, all I have to do is pull the bellhousing bolts and the engine it out.

the new melling pump DOES have the mount for the CPS, so perhaps the previous poster went to an autoparts store that gave him the wrong year part or something.
Arkmage is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:07 PM.