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[Andy B]

 

[Doctor Gollum]

9.5 is fine, even 9 as it's within 10%

The odd one out is obviously #6. So when it comes to it, you've only one head to remove and no more than 4 valves...

How far you go while you're there is up to you, remove and clean both heads and replace the oil cooler would be belts and braces but it's up to you as to how much time/money you want to spend.

Also I doubt you can buy a single head gasket or head bolts for one head...

[countrywoman]

The head bolts for my engine came as just one side, chances are its just intake valves. Check the piston height as found a bent rod on my engine.

[cam.in.head]

also please
does the water pump have a make on it ? just so others know what to avoid in the future .
hopefully yours should be easy to fix now you know . confirmed better once head is off .

[Dave G]

Hi. Both old and new pumps are Quinton Hazell QCP3255.

However, on the failed pump, the nose of the pump was short of the pulley flange by a fair bit - enough for me to comfortably get a grinding disc in to cut it off (see reply 135). And for a roller to be ejected.

On the new pump the nose of the pump goes almost all the way into the step of the flange, leaving no possible escape route for a failed roller from the bearing.

If I’ve not explained that very well I could do a drawing.

[cam.in.head]

ok thanks for that info . wont be using a qh pump then if mine ever needs changing again . cant renember what i put on cos it was 10 years ago . a pic would be good if you can to identify it from the front !

[Dave G]

Hello, an update on the Y26SE head strip-down...

Following JamesV6CDX detailed instructions for head removal I'm now at this point:


(BTW - everything is now oiled and cling-filmed nicely)

Now I have a couple of questions.
Firstly, James says: "Working at the back of the engine (from above) remove the 2 torx bolts holding the rear coolant transfer pipe onto the rear of the engine, and remove any other supporting bolts/brackets."

So, do these bolts go in a forwards direction looking from the bulkhead or downwards somehow? It's very difficult to see round there because of all the other tubing in the way.

Secondly, and less important at the moment, the B*bolt is a bit manked up due to me using a regular ring spanner on it a few years ago. Looks like it's a T12 Torx head and M8, but if anyone knows the exact thread I'll put another on my shopping list in due course.

Cheers and thanks,
Dave

[Migv6 le Frog Fan]

The coolant pipes go in forwards looking from the bulkhead. A mirror can be very useful for things like this.
Cant help on the B bolt thread.

[Dave G]

 
Cheers mate. Appreciate your help,  and thanks for that info.
I will try to get my knuckles in there…

Dave.

[Migv6 le Frog Fan]

Dont remember it being that difficult (although its been a while) but do remember using a mirror to see what was where.
Im sure there were some pics somewhere on here that showed all this stuff, but cant locate them now. 

[polilara]

https://www.omegaowners.com/forum/index.php?topic=90552.0
Can it be seen here?

[YZ250]

………….
Now I have a couple of questions.
Firstly, James says: "Working at the back of the engine (from above) remove the 2 torx bolts holding the rear coolant transfer pipe onto the rear of the engine, and remove any other supporting bolts/brackets."

So, do these bolts go in a forwards direction looking from the bulkhead or downwards somehow? It's very difficult to see round there because of all the other tubing in the way.

You can just about see the torx bolts in this photo.



And this photo shows the actual pipe. It may help with the orientation.

[Dave G]

Crikey, that makes it clearer, but not necessarily easier!

Grateful for those photos, especially of the actual pipe.
Superb pics by the way - where do you get those from ??

As always, grateful for the help YZ…

Dave.

[Dave G]

So, in an ideal world I would never want to see this pipe again…



Ever!

[YZ250]

………….
Superb pics by the way - where do you get those from ??
……….

I’d like to say that I had a secret source but in reality it was just a pot luck google search. 

So, in an ideal world I would never want to see this pipe again…
……………
Ever!

 
Well done.    It helps if you’re a double jointed contortionist for jobs at the rear of the engine.