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Description
KING Main Bearing Set Unflanged | Toyota Corolla 4A 7A | MB5527AMVehicle Fitment & Part Details The KING MB5527AM is an unflanged main bearing set engineered for Toyota 4A series and 7A FE engines, with additional fitment for the Geely MR479QA. Main bearings form the load surface between each crankshaft main journal and the engine block, maintaining oil clearance and supporting the rotating crankshaft assembly. Key Details Detail Value Brand KING Part Number MB5527AM Component Main Bearing Set, Unflanged Oil Groove
Vehicle Fitment & Part Details
The KING MB5527AM is an unflanged main bearing set engineered for Toyota 4A-series and 7A-FE engines, with additional fitment for the Geely MR479QA. Main bearings form the load surface between each crankshaft main journal and the engine block, maintaining oil clearance and supporting the rotating crankshaft assembly.
Key Details
| Detail | Value |
|---|---|
| Brand | KING |
| Part Number | MB5527AM |
| Component | Main Bearing Set, Unflanged |
| Oil Groove | Grooved upper shells only |
| Lug Configuration | 5 left lug + 5 right lug |
| Sold Configuration | Customer specifies oversize at order (STD / 0.25 / 0.50 / 0.75 / 1.00 / 1.50) |
Specifications
| Dimension | Value |
|---|---|
| Housing Size (Max) | 52.045 mm |
| Housing Size (Min) | 52.019 mm |
| Shaft Size (Max) | 48.001 mm |
| Shaft Size (Min) | 47.981 mm |
| Thickness | 2.004 mm |
| Width | 19.860 mm |
| Available Sizes | STD, 0.25, 0.50, 0.75, 1.00, 1.50 |
Vehicle Fitment
View Full Vehicle Fitment (13 applications)
| Make | Model | Engine | kW | Years |
|---|---|---|---|---|
| Geely | CK1 1.5i | MR479QA | Not specified | 2007-2009 |
| Toyota | Conquest 1600 | 4A-L | 81 | 1985-1988 |
| Toyota | Conquest 1600 LS | 4A-F | 81 | 1988-1993 |
| Toyota | Conquest 1600 RS | 4A-GE | 81 | 1986-1988 |
| Toyota | Conquest 180i | 7A-FE | 81 | 1993-1996 |
| Toyota | Corolla 1600 | 4A-GE | 81 | 1986-1988 |
| Toyota | Corolla Avante G | 4A-L | 81 | 1986-1988 |
| Toyota | Corolla 1.6 GL G | 4A-F | 81 | 1988-1993 |
| Toyota | Corolla 160i | 4A-FE | 81 | 1994-1997 |
| Toyota | Corolla 180i | 7A-FE | 81 | 1993-1996 |
| Toyota | Corolla 180i GLE | 7A-FE | 81 | 1996-2002 |
| Toyota | Corolla 1.6 RSi | 4A-GE | 81 | 1997-2002 |
| Toyota | Tazz 160i | 4A-FE | 81 | 2001-2003 |
Fitment Notes
- Customer must specify the required oversize at the time of ordering. Available sizes: STD, 0.25, 0.50, 0.75, 1.00, 1.50.
- This is an unflanged main bearing set. Crankshaft thrust is controlled by separate thrust washers, which are not included.
- Upper (block-side) shells are grooved; lower (cap-side) shells are plain.
- Power figures reflect the catalogue feed and may vary by market specification. Verify against your vehicle before ordering.
Engine Internal Component Notice
Main bearings are critical engine internal components. Correct selection of size, verification of crankshaft journal condition and oil clearance, and proper installation are essential for engine reliability. These bearings should only be fitted by a qualified engine builder or motor mechanic. Always inspect the crankshaft main journals, verify clearances with plastigauge, and follow the engine manufacturer's torque specification for the main cap bolts.
Installation & Maintenance Tips
- Measure the crankshaft main journal diameter before ordering to confirm whether STD or an oversize is required.
- Ensure the correct shells are fitted in the correct positions: grooved shells in the block, plain shells in the main caps.
- Use plastigauge or equivalent to verify oil clearance before final assembly.
- Lubricate bearing surfaces with assembly oil prior to installation.
- Order matching thrust washers separately, as this set is unflanged.
- Torque main cap bolts to the engine manufacturer's specification using the correct sequence.
Common Questions
How do I know which oversize to order?
The oversize required depends on the condition of your crankshaft main journals. After regrinding, your engine builder or machinist will measure the journals and spec
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 2205 reviews
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Product Reviews
★★★★★ 5
BEST EVER!!!
We have a medium sized furbaby. He is the most gentle baby! Except with toys. He destroys everything he gets within 5 minutes. Even the aggressive chewer toys. He’s had these for a solid 24 hours. STILL INTACT!!! He’s loving them! Well, maybe he’s actually frustrated with them! Lol. He was able to stop it from squeaking… but he’s still having a ball playing with them. Not a single rip. I think we may need to put them up for a while to give his jaws and mind a break. BUY THEM NOW!!! Your baby will love them. And if they usually tear things up…. They will be able to enjoy this for a long time!!!
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Reviewed in the United States on September 3, 2023
★★★★★ 3
OK for Fetch, but...
Bounces well but very hard for dog to chew.
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Reviewed in the United States on December 25, 2025
★★★★★ 5
MUST HAVE!!! Dog is obsessed!!!
Color: Aqua
100 PLUS STARS!!! We have a very VERY active pup (6 yrs old 🤦♀️🤦♀️)… he has destroyed EVERYTHING we have ever given him. So I ordered this AND the replacement shell. He has chewed the ball extensively but it is in PERFECT shape, no need for the replacement one YET.. I can not rave about this enough - he LOVES it, we love watching him with it and he won’t let it out of his site at all!! If we touch it he gets upset.. so when we charge it, we put the shell back together and give him that.. which reminds me - make sure you have that screwed TIGHT.. somehow he was able to get it apart.. but once we started tightening it he hasn’t been able to.. thinking about it?? GET IT!! You won’t be disappointed and neither will your dog!!
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Reviewed in the United States on November 15, 2025
★★★★★ 4
An expensive ball to think about
Color: Aqua
Went with the foam ball because I have hopes that my dogs teeth will sink in enough to be satisfying without having to shred it like a tennis ball. So far, so good. I chose this one because the of the outer shell replacement possibility; assurance that 30 dollars towards a ball would have an extended life option for half the price if needed.
It is slightly bigger than a tennis ball and big enough for my dog to be unable to get a strong clench and crush it. He does try though and it's holding up.
All of the options and modes are great.
However, I wish it acted more of a bait ball. Going through all three of the modes, I can't say any have sparked a wild chase.
It will bounce intermittently or once touched. The intervals are long enough to lose my dogs interests. Short intervals make the ball the easy loser every time.
Better on hardwood but pathetic on carpet.
It will roll but not far or very fast.
The only positives from this may be the battery conservation but when he stops playing with it, it is still rolling around the room. I think it takes 20-30 minutes of inactivity for sleep mode.
With this, the charge will last about a day of play.
It does charge quickly.
It has passed the tough chewer test with one who can chew through "tuff" toys in no time but I wish it was more of a challenge.
After telling my sister i purchased one, she said she would've given me hers because her dog had lost interest. Go with your hunch and find another game to invest in if you have trepidations of this being this case.
I won't deduct anymore stars because the product is as advertised. Only one deducted for the price.
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Reviewed in the United States on September 19, 2025
★★★★★ 5
So far so good
Color: Aqua
For the past 2 years I’ve been looking for an interactive ball our dog won’t break within days.
I appreciate that it’s all foam, without any ropes or plastic pieces he can chomp on.
I don’t let him use it as a chew toy but after catching it he does like to chew on it for a little bit, and it’s held up nicely after a month.
Would recommend
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Reviewed in the United States on January 7, 2026