KIS350

Awesome! Thank you! Much appreciated.

It blows my mind that the IS250 runs the same crankshaft. I was totally under the impression that the stroke was considerably different and I thought the flywheel end was different...

Thanks!! I really appreciate your good deed 🤙👌

2013FSport

iTrader: (2)

They are! You have to be careful with how you interpret the chassis codes!!!
250
Bore 83.058mm x Stroke 76.962mm

350
Bore 93.98mm x Stroke 83.058mm

Which begs the question, which block did they list there?
I used the GSE21L-AETLHA = USA SED 2GR-FSE ATM

bazzle01

Ensure you get the block tanked and thoughly cleaned, pipe cleaners etc in ALL oilways.

KIS350

Yeah It's definitely not the same crank as the IS250...not sure if they made a mistake somewhere along the line. I keep seeing the same thing with the crankshaft compatibility
Thanks Bud! Appreciate your help.

KIS350

Update...

Soooooooo only one Conrod journal is messed the other 5 are in great shape only showing some minor defects in the bearing surface (I presume as they picked up pieces of the bearing that broke down). The four main journals show no signs of premature wearing either. The oil galley for the conrod that broke down is clear and clean.

Is it possible that the timing chain tensioner could've caused this damage? Seems a bit excessive for some plastic and I don't think any made it through the oil filter...

Only other damage seems to be some excessive wear on the crank timing gear wear it drives the oil pump. (The Square Profile) The oil pump gears don't seem too worn, however the two corners that contact the most are worn...not sure if this is normal wear or if something nasty went through the oil pump causing abnormal force causing marring on these two surfaces... (I'll try an post some pics)

And lastly...I'm looking for the Crankshaft replacement and can't seem to find much. Does anyone have a good place wear I can find a decent used Crank? I am in Canada but Can easily drive down to the U.S. or have it shipped to my buddies in Buffalo a go pick it up. Just seems to be a hard thing to locate.

Thanks!!

KIS350

Thanks, I absolutely will.

2013FSport

iTrader: (2)

Any machine shop knows this but aluminum blocks can not be hot tanked. The acids are too caustic. Though these days they may have some solution that allows such things! The old stuff could on occasion leave carbon behind but it tore up aluminum.

Crankshaft:
Call around and see if there are any speed shops in the area as one option is too weld up the crank and remachine it back to spec. It may be cheaper than a new used (unknown) crankshaft. It was pretty common back in the day but no clue if its still being done today with all the metallurgy involved.

KIS350

Thanks again! I didn't know the hot tank wasn't good for the aluminum. Thanks.

Being in Canada makes it hard to find parts. There isn't much selection so when you do find something it's crazy expensive. I've found a few good used cranks in the U.S. but they don't deliver to Canada. Going to have delivered to a buds in Buffalo and pick it up there.

All in I'm looking at about $1250 (CAD) for the rebuild. Used crankshaft, Rings, bearings, Oil pump, Water Pump, Heads done, cylinders deglazed, new valves, timing chains and tensioners, gaskets...etc. A used engine up here is going for $2999 (CAD) and up, so I think I'm still ahead.

Thanks again for your help!!

Gville350

iTrader: (10)

When I built Honda motors, I paid to have mine hot tanked and ultrasonically cleaned out. yes, it is a different solution; but a GOOD shop will be able to do it.

Best of luck on this build! Keep us updated!

2013FSport

iTrader: (2)

Years ago at the transmission shop we used commercial grade parts washer and the cleaner was pretty effective but not as good as the boil the cast iron parts chemical solution from the past. Point is both use high temperature boiling processes but the solution is different to be compatible with aluminum.

As mentioned before, double check all oil galleys and verify mechanically they are clean. Look for signs the shop had any screw in plugs out and Double Triple check that all OEM pressed in plugs are secure and have not left the block or heads. It could be an internal oil leak that caused this!

KIS350

Thanks Gville350! Much appreciated.

I will definitely keep you updated on this build, as I go. I'm super interested in what a stage one port and polish job would add to this 3.5L...The heads look really well designed, as far as the shape of the ports, so maybe not much.

Jeff Lange

iTrader: (1)

The IS250/350 share a catalog (for obvious reasons) and so the title of the catalog is IS250/350. Parts within that catalog can apply to one or the other or both. You'd need to look at the model code to see what the part is applicable to (GSE20/21/25/26).

Some websites that list parts cross references list things incorrectly because of this as well, even though it's pretty common practice.

Jeff

KIS350

Thanks Jeff!!

ColdFusion

iTrader: (2)

Am also interested in this, because...

...perhaps this was me?

https://www.clublexus.com/forums/is-...se-this-2.html

OP commented in it too, he helped diagnose what the most likely problem was

Best of luck in rebuilding the engine! Those bearings look wayyy worse than mine did.

KIS350

Lol, nice to hear from you!

Actually, to be honest, when I heard the noise from my engine I immediately thought of your thread...I knew exactly what had happened. The weird thing about mine is I only have one blown bearing. Nothing wrong with the other bearings. But that one bearing...holy...it was pounded into almost nothing. I was on the hwy when it started to deteriorate...

How's your 3.5L doing?