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Scion FR-S / Toyota 86 GT86 General Forum The place to start for the Scion FR-S / Toyota 86 | GT86 |
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#1 |
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just kind of an off-shoot on the chance that a mechanic dropped their tools to frequent this sub.
my oil pump has some issues: ![]() this portion is a bit worn but since I'm rebuilding the engine I wanted to know if this is worth buying the entire housing or if it can be fixed. |
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#2 |
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If you have any doubt buy a new one. Don’t go to all that trouble and expense just to cheap out on the very heart of the engine.
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In addition to what Tcoat said, people have a hard time getting that oil pump to seal properly after removing it from its chamber in the front cover. I would just get a new front cover, it comes with everything you need ( and won't be potentially gouged from being removed)
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That pic is small, and you've not described what's worn out, so there's no way to know. Like Tcoat said, if it's questionable, don't risk it.
If there's a lot of miles, It's a good idea to replace it. If the engine experiences a catastrophic failure, it's a good idea to replace it. If it has low mileage and you want to save some money, and have some precision measuring tools, you can check the pumps dimensions to see if you're within service or at wear limits. If you do buy a new pump, it's recommended to disassembly and check the bypass plunger for smooth action. The backplate screws should also have Loctite applied. |
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Thats being said, if the expense is going to happen then would there be a good after market option with better distribution/performance? |
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Wear limits and inspection procedure are not in the manual. That's a first for me.
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The factory suby pumps have excess flow as-is. The best thing you can do is disassemble, check the bypass piston for smooth action, and reassemble with Loctite on the backplate bolts.
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FWIW, same type of pump is used on both engines. |
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Let me know what you think after reviewing. I understand that they were ripped directly from TIS but your chart is what I'm used to seeing. I have a whole bookshelf full of FSMs for cars I and my family have owned. I'd gladly pay for hard copies of everything available for the twin too.
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Thank you! |
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What is the mileage on that pump assembly? Looks to be some decent scoring. How do the rotor faces (teeth) look?
The bypass should move smoothly. Not somewhat smoothly, it should be smooth. It should also come right out. Is the plunger bore scored? Plunger itself have any wear? Not uncommon, if a plunger sticks, it happens when cold and pressure is highest. as the oil warms, the plunger stays open and pressure will tank. 5psi at idle is LOW. What location were you measuring pressure at? I would cut apart the oil filter just as a precaution in case there is more going on here. |
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