2007 Sonata 2.4l Engine w/ Bad Bearings - Hyundai Forums : Hyundai Forum
 
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post #1 of 5 (permalink) Old 04-14-2019, 06:41 PM Thread Starter
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2007 Sonata 2.4l Engine w/ Bad Bearings

I have a 2.4l Theta engine that I pulled from a junkyard 2007 Sonata. I tore it down and found that it had some metal shavings in the oil pan, and all of the rod bearings are shot. Main bearings are in much better shape, but I still wouldn't reuse them. The crankshaft looks good enough for me to get away with a polish, but I'd let the machine shop figure that out.



I just wanted to get some tips from people that have experience with this engine. Where would you guys go from here? I haven't pulled the head off yet, but the cams look great, and the engine turns over smoothly. I'd love to just leave the head in place and repair the bottom end, but I know that's probably not a good idea.



I also want to tear the oil pump/balance shaft down to see how everything looks good in there, but I don't think the FSM has any information to help me out. Does anyone have some tips/info? I've never taken one of these units apart before, but I think the main bit of info I'd need would be the torque specs/sequence for reassembly.


Thanks in advance!
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post #2 of 5 (permalink) Old 04-14-2019, 08:15 PM
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Tear the whole thing down and wash it all out.. keep tappets in same order as they come out, both intake and exhaust side,, they vary thickness for valve lash

Replace chains, guides, and tensioners, along with that oil jet pipe that shoot oil on chain.. You may find a round rubber biscuit between cylinder head and front cover,, leave it out when re-assemble,, that was a change they made later in life, new cover dont even have the tin attached

Watch cylinder bores for scuff, along with piston skirts.. maybe use aftermarket quality name piston ring set,, Hyundai ring set is low tension, so poor oil control

Balance shaft-oil pump... you not getting it apart,,,,,,, buy new using VIN on block, along with the bolts that hold to bottom of block (use VIN off VIN tag of block to order bolts),,, DO NOT TOSS old bolts till new install,, 3 or 4 different length used in various combo,, That why I say USE VIN on tag on donor block to order parts..

You'll want new head bolts also,, DO NOT USE old head bolts

Torque wrench everything

Use the caulk gun tube of Hyundai RTV,, let sit 24hr for good start on cure..

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post #3 of 5 (permalink) Old 04-14-2019, 08:53 PM
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post #4 of 5 (permalink) Old Yesterday, 08:58 PM
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Honestly, there are so many of these cars out there, I'd probably not spend to rebuild a worn/abused Sonata engine. Find a rear hit parting out or buy another from a junkyard, but test it properly and get a warranty.

2007 Sonata 2.4L 4-cyl. Auto 142K
2005 Elantra GT, 2.0L Automatic, 165K
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post #5 of 5 (permalink) Old Yesterday, 10:14 PM
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Quote:
Originally Posted by sbr711 View Post
You may find a round rubber biscuit between cylinder head and front cover,, leave it out when re-assemble,, that was a change they made later in life, new cover dont even have the tin attached
I just did a timing chain on my Gen Coupe and noticed that. Looks like it funnels oil down the front of the cover behind the steel insert.

What is the purpose? I assumed cooling as it does cool almost too much in the winter. Oil never gets much above 180F and if really cold out lower.

Borrow money from pessimists -- they don't expect it back.
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