Oil
Pump (EA82)
style=’font-family:Arial’>
style=’font-size:14.0pt;font-family:Arial’>Follow the
href=”timingbelt.htm” target=”_parent”>Timing Belt Removal procedure
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style=’font-size:14.0pt;font-family:Arial’>Oil Pump Removal and
Replacement
With
the Timing Belts removed, now you can service the oil pump. There are 5
bolts that hold the pump on. One in the middle, one on the left, and three
around the sprocket. Loosen each bolt with a 10mm ¼” drive socket.
You may have to remove the driver side belt idler pulley to get the plastic
out of the way, especially if you are replacing seals. The pump will pull
straight away from the motor, it may need a tap to loosen it. Usually the
pump rotor will stay with the engine as it comes apart. Installation is
reverse procedure
style=’font-size:14.0pt;font-family:Arial’>Oil Pump Inspection
Inspect the rotor
and shaft of the oil pump for excessive wear and garring. Check the condition
of the seal on the shaft, the o-rings, and clean up the pressure relief
spring.
style=’font-size:14.0pt;font-family:Arial’>Oil Pump Seals
I
have found that using an impact and 12mm socket is good to remove the pump
sprocket. Wit the sprocket Removed, the shaft will slide out. The seal
can be replaced now.
Replace
the seal and reinstall the sprocket, with an impact, do this with the pump
off (or do it with the pump filly assembled and on the car, to prime the
oil system) There is an o-ring around the base of the pump, and a “mickey
mouse” shaped o-ring that goes against the mating surface.
The
rotor can go either on the pump or in the motor, with the letter “B” facing
the motor Make sure the o-rings are lined up, and that the oil pump seats
against the motor flush. The sprocket should turn freely. Snug the 5 bolts
down, middle, left, then right until you know the pump is flush, turns
freely, then torque down. Use a ¼” drive socket sop you don’t over
torque and break the bolts!
style=’font-size:14.0pt;font-family:Arial’>Oil Filter
There
will be some argument to what oil filters to use. Fram is bad, stay away
from them. Wix and Purolator are good ones. I like Napa Gold 1361; it ranks
with the top brands
Specifications
and service data (1989 FSM) Tables generated by Miles Fox
Specifications
| Lubrication type | Forced feed, full flow filtration, splash type | ||
| Oil pump |
Pump type | Trichoid type | |
| Discharge performance 1 | Discharge-pressure | ||
| Speed | 500 rpm | ||
| Oil temperature | 75 – 85 deg C (167 – 185 deg F) | ||
| Discharge performance 2 | Discharge-pressure | ||
| Speed | 5000 rpm | ||
| Oil temperature | 75 – 85 deg C (167 – 185 deg F) | ||
| oil relief valve | Pressure at which valve starts to open | 57 – 64 psi | |
| oil bypass valve | Pressure at which valve starts to open | 21 psi | |
| Oil filter | Type | Paper, cartridge type | |
| Filtration area | .037 m2 (1.4 sq ft.) | ||
| Engine oil capacity | Upper level | 4.0 L (4.2 qt) | |
| Lower level | 3.0 L (3.2 qt) | ||
| Oil pressure switch | Type | Imersed contact point type | |
| Voltage | 12 v | ||
| Warning light | 12 v – 3.4 w or less | ||
| Pressure at which switch closes | 21 – 36 psi | ||
| Pressure at which switch opens | 21 – 36 psi | ||
| Proof pressure | 142 psi or more | ||
| Oil pressure gauge | Type | Bimetal type | |
| Voltage | 12 v | ||
| Pressure range | 0 – 114 psi | ||
Service Data
| Oil pump | Inner rotor diameter | 35.65 – 35.70 mm | (1.403 – 1.4055 in.) | |
| Outer rotor diameter | 49.95 – 50.00 mm | (1.9665 – 1.9685 in.) | ||
| Inner and outer rotor height | A | 13.89 – 13.91 mm | (.5468 – .5476 in.) | |
| B | 13.90 – 13.92 mm | (.5472 – .5480 in.) | ||
| C | 13.91 – 13.93 mm | (.5476 – .5484 in.) | ||
| height of oil pump case projection | 7.97 – 8.00 mm | (.3131 – .3150 in.) | ||
| Rotor housing depth | 21.96 – 22.04 mm | (.8646 – .8677 in.) | ||
| Side clearance between inner or outer rotor and crank case |
Std | .05 – .16 mm | (.0020 – .0063 in.) | |
| Limit | .18 mm | (.0071 in.) | ||
| Case clearance between outer rotor and crank case |
Std | .10 – .18 mm | (.0039 – .0071 in.) | |
| Limit | .22mm | (.0087 in.) | ||
| Relief valve spring | Free length | 47.1 mm | (1.854 in.) | |
| Installed lenght | 33.5 mm | (1.319 in.) | ||
| Load when installed | 3.88 – 4.28 kg | (85.6 – 9.44 lbs.) | ||
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