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#4325329 - 02/09/17 05:32 PM Rust on JDM engine Camshaft?! Was I ripped off?
Kurtatron Offline


Registered: 04/06/10
Posts: 168
Loc: Detroit
Hey everyone.

I am working on replacing my 1991 Toyota Previa Engine with a JDM replacement. Before buying, I asked the seller for pictures of the inside of the engine. At first, it looked great!



Once I actually received the engine, i noticed some grit on the camshaft lobes that wasn't coming off with the rub of my finger! It looks like rust!



I mean, the engine looks great otherwise, but you can see some more rust on the cam gears.



Guys, is this a problem, or do you think this engine will be a ok to install? I could use my old cams, but they have 200k miles on them, and they are heavily tarnished, but the engine ran before pulling. What do you guys thing? Thanks!

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#4325332 - 02/09/17 05:38 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
skyactiv Offline


Registered: 03/02/13
Posts: 4397
Loc: The Midwest
I'd hit it with some 220 grit emery cloth or sandpaper and not worry about it.
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#4325333 - 02/09/17 05:39 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
It's not on the lift part of the cam, you should probably just sand it off as gently as possible with the softest grit that works. The rust is what happens when an engine is exposed to the elements with no oil coating everything.
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#4325353 - 02/09/17 05:57 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17776
Loc: PNW
Scotch-brite would probably work better than sandpaper in this case. If using sandpaper, I'd go with something like 600 grit wetted with oil.

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#4325432 - 02/09/17 07:00 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
JR Offline


Registered: 08/08/04
Posts: 1320
Loc: Michigan born but my heart bel...
scotch-brite or real fine emery cloth, I see this everyday. Nothing but surface stuff, dont worry.

Heck that shaft may have 200k on it too, cranks, cams. rods, you name it, gets cleaned up and reused.
It is common, new pistons/rings, seals, check/replace pump.



harvey
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#4325477 - 02/09/17 07:32 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
Trav Offline


Registered: 11/20/06
Posts: 18892
Loc: MA, Mittelfranken.de
Don't sweat this, I don't use Scotchbrite pads, wheels or sandpaper inside an engine it has the potential to do more harm then good even when wetted with oil.
Personally I would just wipe it down with Kroil or Liquid Wrench and a lint free cloth and forget it.
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#4325493 - 02/09/17 07:58 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Trav]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4050
Loc: North Carolina
Originally Posted By: Trav
Don't sweat this, I don't use Scotchbrite pads, wheels or sandpaper inside an engine it has the potential to do more harm then good even when wetted with oil.
Personally I would just wipe it down with Kroil or Liquid Wrench and a lint free cloth and forget it.

Yep, don't sweat it. It'll come off as soon as you fire it up.
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#4325498 - 02/09/17 08:10 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
I've taken light rust like that off with 4500 grit and oil. Engines are still running years later with no issues.

Try a penetrating oil and cotton rag first.
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#4325512 - 02/09/17 08:26 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
Chris142 Offline


Registered: 06/05/03
Posts: 16822
Loc: Deplorable in apple valley, ca
They probably pressure washed it.
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#4325517 - 02/09/17 08:37 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
Kool1 Offline


Registered: 01/25/13
Posts: 906
Loc: California
I've used JDM engines in a few beaters and sold them about 15 years ago. One was an Isuzu pickup and the other was in a Toyota Camry. I sold the Isuzu pickup to an auto repair garage and they drove it for a few years with the same drivetrain without any problems. The JDM engines were cheap enough but I never liked the thought of having an engine with an unknown history in my own personal, keeper vehicle.

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#4325906 - 02/10/17 11:21 AM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Trav]
OVERKILL Offline


Registered: 04/28/08
Posts: 36464
Loc: Ontario, Canada
Originally Posted By: Trav
Don't sweat this, I don't use Scotchbrite pads, wheels or sandpaper inside an engine it has the potential to do more harm then good even when wetted with oil.
Personally I would just wipe it down with Kroil or Liquid Wrench and a lint free cloth and forget it.


This. It will probably wipe right off with oil.
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#4325920 - 02/10/17 11:33 AM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
Kurtatron Offline


Registered: 04/06/10
Posts: 168
Loc: Detroit
Ok, well guys. I have been looking in deeper into the engine. I decided to pull the oil pan. I'm here at work and have limited tools and time, so I wasn't able to get everything else off to the oil pan completely off. There's rust on the block, crankshaft, and rods. Is this gonna be a problem? Am I really ok if I the thing tests ok with a compression test? I am planning to take it to my mechanic for a compression test, and expert opinion. I am so disappointed with this engine so far...




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#4326187 - 02/10/17 06:26 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
Le_bow_ski Offline


Registered: 01/22/10
Posts: 75
Loc: California
That much rust would perturb me. There's no call for any rust in a replacement motor you weren't planning on rebuilding. How are the cylinder bores?

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#4326258 - 02/10/17 08:55 PM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
Trav Offline


Registered: 11/20/06
Posts: 18892
Loc: MA, Mittelfranken.de
Lie the previous poster said look at the bores. I would look at the piston pins also, pull the main and rod caps one at a time starting from the middle for a look see if no wear marks and or rust on the crank journals and if the bearings are okay lube them up with assy lube and rotate by hand with a socket to smear it around the whole bearing.

The rust on the iron isn't going to cause any harm, wipe as much of it as you can away with oil and a rag. If its all good I would definitely do a couple of real short OCI with new filter. I would be disappointed too but give it a close inspection before condemning it, start up is going to be critical, lots of assy lube on bearings and oil everywhere before cranking.
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#4326439 - 02/11/17 08:19 AM Re: Rust on JDM engine Camshaft?! Was I ripped off? [Re: Kurtatron]
andyd Offline


Registered: 09/25/04
Posts: 7151
Loc: Marshfield , MA
Isn't this rust due to a sea voyage with all the liquids drained . How hard would it be to get a look at the cylinders? Or do a compression test on the engine stand? Or fuhgeddaboutit. Maybe a fill with cheap oil and a short OCI. You aren't supposed to get emery dust or ALO2 near an assembled engine.


Edited by andyd (02/11/17 08:20 AM)
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