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DIY Engine Rebuild Costs #5274079 11/21/19 10:01 PM
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Spetz Offline OP
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Hi everyone,

I've always wanted to do a DIY engine rebuild and have come across a project I am interested in.

This is covering the short block only and only machine shop costs.

If the engine being rebuilt is in tact (i.e., did not suffer catastrophic damage) would measuring the journals etc and doing a standard rebuild with just a hone be sufficient?
Or will the crank journal need to be honed?
Also how difficult/costly would oversize bore be by 0.5mm?

I would attempt to take most measurements myself however there are things that perhaps the machine shop might need to do for me


2003 Mitsubishi Diamante 6G74. 165k miles.
Penrite HPR10 10W50, 12K km OCI
UOA:
https://www.bobistheoilguy.com/foru...ante-shu-5w40-1-2-can-mos2-7-8k-mile-oci
Re: DIY Engine Rebuild Costs [Re: Spetz] #5274083 11/21/19 10:07 PM
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P10crew Offline
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What engine are you thinking about doing?

Re: DIY Engine Rebuild Costs [Re: Spetz] #5274087 11/21/19 10:25 PM
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Spetz Offline OP
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It'll be to a 6A13 Mitsubishi short block.

Just a standard rebuild with potentially oversized pistons.


2003 Mitsubishi Diamante 6G74. 165k miles.
Penrite HPR10 10W50, 12K km OCI
UOA:
https://www.bobistheoilguy.com/foru...ante-shu-5w40-1-2-can-mos2-7-8k-mile-oci
Re: DIY Engine Rebuild Costs [Re: Spetz] #5274113 11/21/19 11:34 PM
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borgward Offline
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The problem with DIY rebuild is finding a shop that does good work. I stopped rebuilding engines my self because I walked into the machine shop and realized they had the same old equipment they had when I was young. I could get about 80,000 miles on my Datsun rebuild before it began using oil. I wound up ordering a reman from Nissan in Japan (not a 30,000 mile used one from Japan) I would get close to 200,000 miles on one of those. That's driving driving flat out most of the way at for 160 miles and 100 miles late at night. I ordered a ford engine rebuilt in the USA (not by Ford). Was not impressed with what I got.

If you can not get a reman by Mitsubishi, Don't have the crank turned under ten thousands. Do have the cylinder bored by a shop. Just doing a ring job and only reaming the top of the cylinder will only last so long.

Re: DIY Engine Rebuild Costs [Re: Spetz] #5274131 11/22/19 12:40 AM
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vw7674 Offline
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Crank journals don't get 'honed', that is for cylinder walls. They do get cut for undersized bearings & they can be simply polished if they have no damage.

Re: DIY Engine Rebuild Costs [Re: Spetz] #5274136 11/22/19 12:55 AM
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UncleDave Offline
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How much if any crosshatch is left should give you at least an idea of wether you should bore or hone.

If you bore have the shop use a torque plate or you'll end up with an oil burner pretty quick.

Overbore will cost new pistons, rings, and likely a trip to the balance shop - mostly likely new wrist pins

If you are lucky the crank can be polished.


Uncle Dave
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Re: DIY Engine Rebuild Costs [Re: Spetz] #5274207 11/22/19 06:26 AM
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zzyzzx Offline
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I've always wanted to do a DIY engine rebuild...

Start out with something small, like a weed whacker or lawn mower, and work your way up to a car. In fact, your first car engine rebuild should probably be a small 4 cylinder car where you can do an in the car partial rebuild (meaning that you don't even remove the engine block from the car).

Re: DIY Engine Rebuild Costs [Re: Spetz] #5274217 11/22/19 06:46 AM
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Donald Online Content
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I did this on a Ford 289 Mustang engine. Bored with pop up pistons. Crank cut. Engine hot tanked to clean it. I put it back together. 3/4 grind cam. Lots of help from my Dad as I was 17 I think. Learned a lot.

With my Jeep engine failure, I bought a reman engine.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
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Re: DIY Engine Rebuild Costs [Re: Spetz] #5274238 11/22/19 07:11 AM
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spasm3 Offline
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Depends on what you are starting with. It its an engine you bought, everything has to be checked. Probably by a machine shop is best. If its an engine in a car you've owned since new and its been maintained with good oil service and not overrevved, you could check things yourself. Look at the bearings as you tear down. Send the head to the shop. Check the freeze plugs for corrosion. Make sure everything is really clean on reassembly. I'd use a bore brush to hone if you go that route. Wash the block out good afterwards. Use a brush to clean the bores with soap. Wash until you can wipe the bore with a paper towel and stays clean. Get a good torque wrench, not an HF one.


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03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 17000 miles synpwr 5w30
Re: DIY Engine Rebuild Costs [Re: spasm3] #5274261 11/22/19 07:44 AM
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mattd Offline
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The cost will widely vary depending on what kit you use and what it needs for machine work. With boring the cylinders and line honing the mains (or at least checking it) would be the only way I would want to do it IMO. What’s going on with the engine?


2007 Ford F-350 4x4 6.0 PSD

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Re: DIY Engine Rebuild Costs [Re: Spetz] #5274281 11/22/19 08:01 AM
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Chris142 Online Content
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I have rebuilt a few had the matching farmed out of course. I did the final assembly,hand fitted every ring.


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Re: DIY Engine Rebuild Costs [Re: Spetz] #5274289 11/22/19 08:11 AM
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Consider the cost of a salvage yard engine .


Wyr
God bless
Re: DIY Engine Rebuild Costs [Re: Spetz] #5274422 11/22/19 10:04 AM
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The one major mistake DIY overhauls often have is the failure to clean all oil passages with a bristle brush. Including inside the crankshaft.


People who count on their fingers should maintain a discreet silence.
Re: DIY Engine Rebuild Costs [Re: Spetz] #5274442 11/22/19 10:33 AM
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meep Offline
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Agree with the issue finding a good machine shop. I did a DIY a while back, chevy 283. I was taking my time and waited a while for another shop to rebuild the trans while it was all out. Only after final assembly and startup did I find the hairline crack caused by rushed machining right on the oil pump's output journal. Leaked 1 quart per hour. Went back to work with them and the doors and windows were shuttered. Very disappointing.


2018 F150
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Re: DIY Engine Rebuild Costs [Re: Spetz] #5274583 11/22/19 12:54 PM
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thastinger Offline
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Good machine shops are a PITA to deal with because they are super busy and usually have commercial accounts that will bump you right out of the rotation. Be prepared to wait.

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