Kubota V1702 questions:

[EdKubotaL355]

1) Do any of you know if the V1702 Kubota engine is a wet or dry sleeve block?

2) After getting the head magnafluxed I found the head to be cracked between the #3 valves and pretty warped...what are the odds of the block/sleeve to be cracked on these engines?

3) before the head was removed the oil pressure was reading: Idle @ 25-30 psi & Operating RPM @ 50-60 psi ... are these good values?

4) Pressue test reulted:
4 = 260 psi
3 = 128 psi
2 = 160 psi
1 = 262 psi

5) The head gasket shows evidence that the cylinder was breathing between all of the cylinders which could explain the low compression values.

6) If a sleeve was cracked would it be visible to the naked eye?

7) If the bore checks good, I would like to re-ring, hone and place new bearings in the lower end (along with a new head to replace the cracked one). Thoughts?

8) I did not treat this poor tractor like mud... the old farmer who ran it with it white stacking before me did, however... I picked it up as a project tractor for our midwest acreage and am just trying to gain an idea where we are sitting before buying parts. Thanks in advance for all the help!!

 

[007kubotaguy]

Hello
The sleeves are dry. You can buy oversize pistons and bore the sleeves one time. In 40 years I've never seen a cracked sleeve in a Kubota Engine. The oil pressure readings you have are fine. Great tractor. Good luck with your project. Did you find a cylinder head yet?
Lance

 

[North Idaho Wolfman]

#1 the L355 I've got a brand new cylinder head for a V1702 that I would part with for cheap.
I have any other parts you could need too, I have the whole engine.
The engine I have needs bored or resleeved.

And I'll second what Lance said, I've never seen a block or sleeve cracked, unless a piston or rod went through it.

There is 2 different sources that one lists the motor as a V1701 IDI and the other a V1702 IDI, so read on the block on the flat right next to the injection pump the engine number, it will be a stamped in # not a cast #. should read V1702A-XXXXX

 

[EdKubotaL355]

Sounds like to me I should be fairly safe with replacing the head only, for now. I was planning on purchasing this head from amazon for $640 w/ full gasket kit:
https://www.amazon.com/gp/product/B07P7QPLCQ/ref=ox_sc_act_title_1?smid=AH13DMJHYILIY&psc=1

@Wolfamn - Just curious, is your L355 at the end of it's run? Pretty sure my V1702 is an IDI and will look at the stamp # tomorrow.

Is that an IDI head in the amazon link?

 

[North Idaho Wolfman]

My V1702 IDI was out of a Bobcat, same engine as what you have.

That cylinder head is an IDI head.

I still will make you a way better deal than amazon on a complete new head all parts included (new valves, springs, seals, and such), but then again free shipping is a nice incentive.

 

[EdKubotaL355]

Wolfman! I don't care what anyone else says you are a great guy in my book!!! Thanks for all the help you provided to us in getting out L355SS back up and running!! cheers mate!

My V1702 IDI was out of a Bobcat, same engine as what you have.

That cylinder head is an IDI head.

I still will make you a way better deal than amazon on a complete new head all parts included (new valves, springs, seals, and such), but then again free shipping is a nice incentive.

 

[lugbolt]

By chance are any of the rods bent?

 

[EdKubotaL355]

By chance are any of the rods bent?

No glaring signs of a bent rod. Though I have not gotten around to performing another pressure & leak down test...I will say after just shy of 200 hours with the new head (and gasket) she hasn't used a single lick of oil or coolant!!

 

[North Idaho Wolfman]

No glaring signs of a bent rod. Though I have not gotten around to performing another pressure & leak down test...I will say after just shy of 200 hours with the new head (and gasket) she hasn't used a single lick of oil or coolant!!

I heard it running, you don't have any bent rod issues, if you did it would be a hard start and would blow black smoke!

Your L355SS tractor sounds sweet!

 

[lugbolt]

Had a BX2380 in recently.....absolutely NO sign of any engine problem whatsoever. But I noticed it was weak (customer did not complain of anything), or should I say weaker than I thought it should be. Did a quick compression test. #1 645. #2 620. #3 510. Pulled the head and found #3 and #2 rod bent slightly. Customer owned up to use of starting fluid the one time he ran it out of fuel. No smoke, no hard starting, nothing--I just noticed it to be a little weaker than I remember the 2380's being while test-mowing with it. Replaced 2 rods, back to normal. Not a hard job either; at least not on that one. Did an M5040 in June with 3 bent rods due to rollover/fill cylinders with oil and that one was obvious, one of the rods was hitting the block, was actually easier than the BX since I could get to them from under the tractor without removing the engine.