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Author Topic: Something leaking from top of engine  (Read 1121 times)

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senorquill

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Something leaking from top of engine
« on: October 15, 2021, 09:55:00 AM »

Hello all,

What could be causing this yellow sort of glue like material to come out of the back side of the forward most fuel injector? I'm not sure exactly where it is come out, but photos help to explain. The engine is running fine. There was also some tiny piles of what looked like water bubbles.

Universal M25XP (1700 hrs)- 1987 C34

Ryan
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MQ

senorquill

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Re: Something leaking from top of engine
« Reply #1 on: October 15, 2021, 09:55:54 AM »

Pic 2
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mark_53

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Re: Something leaking from top of engine
« Reply #2 on: October 15, 2021, 11:15:38 AM »

Looks like blue thread lock to me.  Are you color blind or an I not seeing yellow?
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Noah

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Re: Something leaking from top of engine
« Reply #3 on: October 15, 2021, 11:53:08 AM »

Blue thread lock will not STAY blue when old. It looks like saltwater corrosion mixed with debris/oil??? óbut I am not a mechanic. Do you see liquid emerging around there when engine is really clean and running?
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Ron Hill

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Re: Something leaking from top of engine
« Reply #4 on: October 15, 2021, 03:00:22 PM »

Ryan : I'd cleanup that area and keep an eye on it!!  It may just be the old dirt from 1987!?!

A thought
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Stu Jackson

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Re: Something leaking from top of engine
« Reply #5 on: October 15, 2021, 06:10:46 PM »

Ryan : I'd cleanup that area and keep an eye on it!!  It may just be the old dirt from 1987!?!



A good possibility that had also occurred to me and that those very helpful photographs can't begin to help us "know".
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

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Admiral_Swellson

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Re: Something leaking from top of engine
« Reply #6 on: October 18, 2021, 07:20:21 AM »

This is just a guess but it could be Blue Devil Gasket Sealant.

https://www.amazon.com/BlueDevil-Head-Gasket-Sealer-ounce/dp/B000NOO798?th=1

What it looks like after: https://www.youtube.com/watch?v=LiDROcUG3iQ


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senorquill

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Re: Something leaking from top of engine
« Reply #7 on: December 04, 2021, 11:52:39 AM »

Gents,

I cleaned it all up and discovered a crack on the plate behind the thermostat (pics attached). After running the engine up and getting hit hot, I was able to notice coolant coming out of the back side of that plate. So the goopy material was coolant that was basically leaking and than heating up and turning into basically a Vaseline type material. Anyways, I going to tighten up the 2 bolts in the pics to see if that slows the leak, a leak confirmed since I. loss coolant every time I motor around for an hour or so.

I'm going to order a new replacement part due to the crack. Any body replace this? Looks like I got to take a lot off the front of the engine to do it. Any info would help.

V/R,

MQ
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Ron Hill

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Re: Something leaking from top of engine
« Reply #8 on: December 04, 2021, 01:43:50 PM »

Guys : It is absolutely amazing how much easier it is to find leaks etc. on a CLEAN engine!!!

A thought    :thumb:
« Last Edit: December 04, 2021, 01:51:29 PM by Ron Hill »
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KWKloeber

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Re: Something leaking from top of engine
« Reply #9 on: December 04, 2021, 08:38:27 PM »

What plate behind the thermostat? 
The picture pointing to the thermostat housing isnít helpful as it doesnít show what plate youíre referring to.
Can you post a better picture?
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senorquill

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Re: Something leaking from top of engine
« Reply #10 on: December 05, 2021, 07:00:39 AM »

What plate behind the thermostat? 
The picture pointing to the thermostat housing isnít helpful as it doesnít show what plate youíre referring to.
Can you post a better picture?

The par with the crack on the plate, which the thermostat housing is screwed into, is part number 13 on the Water Flange Group (Flange Water-300233).

It looks like I have to remove the entire Water Pump Group casing to replace it, the last picture with the red line going around it.

Has any replace the Flange Water before? What am I getting into?

MQ
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senorquill

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Re: Something leaking from top of engine
« Reply #11 on: December 05, 2021, 07:18:49 AM »

The large part that has to come off first is the Gear Case Assembly #2 on this picture.
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KWKloeber

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Re: Something leaking from top of engine
« Reply #12 on: December 05, 2021, 08:14:05 AM »

PS: Messicks.com is a decent place to order parts online.  Many of the Kubota manuals I posted came from those folks.


Ahhhh, ok NOW I see. The bottom picture didnít open when looking at the post on my phone.
Check the service (Technical) Manual on the Wiki - it might discuss something about disassembling the gear cover.

The wiki will also have the Kubota part numbers for the Water Flange and the Gear Case gaskets, o-rings.  I would replace the oil relief valve and TStat while you have it off.

I wonder what caused the crack. Maybe the alternator bracket?
« Last Edit: December 05, 2021, 08:17:17 AM by KWKloeber »
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
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senorquill

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Re: Something leaking from top of engine
« Reply #13 on: January 08, 2022, 07:20:13 AM »

When you put the new gaskets back is their any type of grease or sealant that goes on them, or do you leave them as is? Thanks,

MQ
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KWKloeber

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Re: Something leaking from top of engine
« Reply #14 on: January 08, 2022, 08:21:51 AM »

Itís not necessary but if it makes for an easier install Kubota suggests a non hardening gasket sealer, one side only, and apply the gasket. I donít recall the Permatex part number number for that type but itís been called out on here before if you do a search.
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain
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