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  Topic Review (Newest First)
Yesterday 07:56 PM
1750GT After removing the bad exhaust valve guides....the new ones were ready to go in. I will be installing oil seals on the exhaust guides as well hence the difference with the original non-seal ones. Getting the guides out was a bit of a task...but it just took many repeated small amplitude blows with a 3 lb hammer (I was afraid of mushrooming the guide if a heavy blow was applied to them)....it was good work-out I'll tell you.

Attachment 1584074

The exhaust valves I bed blasted then polished them out a little bit by chucking them in the lathe and using wet sand paper.

Attachment 1584076

The head was sent out to have .006" machined off since the surface was lightly pitted and corroded. The valve seats were also re-faced and lapped.

Attachment 1584078

Which brings me to this week's work....re-installing all the valves, springs and oil seals then using the recommended factory method for checking the sealing at the valve faces. Which entails filling the chambers with white spirits or varsol and blowing compressed air from the port side and on the back of the valve heads....then looking for air bubbles.

Sure enough, only 2 valves were not leaking.....the other 6 were leaking ...so I will have to lap some more...

Attachment 1584080
Yesterday 07:28 PM
1750GT
Cylinder Head Rebuild

I started the cylinder head rebuild a few months ago while multi tasking on the engine block and crankshaft work. Cleaning was the first obvious chore at hand......commencing with degrease and wash.

Attachment 1584066

What was left was the usual carbon build-up around the valve seats and inside the ports.

Attachment 1584068

The valve deposits were unreal....probably about 1/8" thick of caked on carbon on both sides......

Attachment 1584070

After thoroughly sealing & duct taping out all the water passage openings and all oil passage openings...off to the blast cabinet went the head for some bead blasting. That was the only way to get that carbon completely off.

Attachment 1584072

Next...careful measurements of the valves & valve guide bores were taken. Amazingly the exhaust valves were within spec, but the exhaust guides were totally way out of spec by at least .010" over .....probably explains why so much oil was being deposited on the exhaust valve heads.

On the intake valve side...all the guides were within spec....but the intake valves were badly pitted at the seat contact areas. So an order for 4 new intake valves and 4 new exhaust valve guides was placed...along with a full complement of gaskets and seals all around.
08-18-2019 03:06 PM
1750GT I feel I reached a mini milestone on the engine build. About 10 years ago I was disassembling the bottom end of the engine....


Attachment 1583322

..after today's activities.....good thorough cleaning....and yet more hardware plating....

Attachment 1583324 Attachment 1583326

.....I am declaring the bottom end as completed!.... But I do need to install the rear main seal and flywheel and complete the torquing of that large pulley nut....(this is where I wish I had build a proper ALFA engine stand that allows full access to the back of the engine)....Instead of going with this cheapo generic one.
08-16-2019 04:59 PM
ossodiseppia Ok, Rossano. I got your email. When I get off my butt, I'll reply and we will get you hooked up.
08-16-2019 01:13 PM
1750GT
Quote:
Originally Posted by ossodiseppia View Post
I had two printed and I have one left. ....
I'll take that for sure...sent you email. Thanks
08-16-2019 04:05 AM
ossodiseppia
Quote:
Originally Posted by 1750GT View Post
COMIT is cast on it. I would assume that depending on which filters are used ...the stickers (or marking in the case of the OE) will be different. Funny that out of all the duplicate stickers I acquired over the years...I have none for this filter.
I had two printed and I have one left. I do not know when I will have some more printed, but hopefully before you finish.

It's a water slide decal which will need to be clear coated.
08-16-2019 03:49 AM
1750GT
Quote:
Originally Posted by quadrifolio View Post
Iīve seen this spacer also in a Spider mk2 witk monofarfale spica injection, but in this case was to clear the cranck poely due to having A/C system fitted, the compresor is a Sandem one
That makes sense....I suppose that if I were to not use the aluminum spacer, the fan would still fit on the pulley properly. The spacer does move the fan further forward and into the radiator shroud ...which may be better for cooling when the car is not moving. Either way I'll see how things fit when the engine and radiator are re-installed.
08-15-2019 10:29 PM
quadrifolio
Quote:
Originally Posted by brad fischer View Post
Why is the water pump pulley so deep?
Iīve seen this spacer also in a Spider mk2 witk monofarfale spica injection, but in this case was to clear the cranck poely due to having A/C system fitted, the compresor is a Sandem one
08-15-2019 07:20 PM
1750GT
Quote:
Originally Posted by brad fischer View Post
Why is the water pump pulley so deep?
That's what was fitted to the engine originally and is used to space out the deeper fan blade that is fitted to the US models. Even though I can't seem to locate it as a seperate part# in the US part catalogue...it maybe part of the fan blade as an assembly?
08-15-2019 07:02 PM
1750GT
Quote:
Originally Posted by ossodiseppia View Post
What brand of oil filter is that?
COMIT is cast on it. I would assume that depending on which filters are used ...the stickers (or marking in the case of the OE) will be different. Funny that out of all the duplicate stickers I acquired over the years...I have none for this filter.
08-15-2019 06:14 PM
PSk
Quote:
Originally Posted by brad fischer View Post
Why is the water pump pulley so deep?
Can't swim ...

Pete
08-15-2019 06:09 PM
PSk
Quote:
Originally Posted by ossodiseppia View Post
What brand of oil filter is that?
Cartridge. Screw on came out with the 2000, I believe.

Pete
08-15-2019 02:03 PM
brad fischer Why is the water pump pulley so deep?
08-15-2019 05:10 AM
ossodiseppia
Quote:
Originally Posted by 1750GT View Post

..and for good measure I threw on the alternator.....I'm finally starting to see the light at the end of the tunnel on this engine build...especially since the cylinder head is all ready to be re-assembled....(pics to follow)...

What brand of oil filter is that?
08-15-2019 04:02 AM
1750GT Well as it turned out...the balancing shop did not have the circlips in their possession....and as so often happens with misplaced items....sometimes you just need to take a break and resume the search...and sure enough a few days later....I find the dang things right there in the corner of my work bench!

Attachment 1582644

The liner o-rings however were nowhere to be found....so a quick call to Classic Alfa...was needed to order a new set (with a spare for good measure). I believe this time they came in record time..4 days amazingly. That allowed me to finally complete the installation of the liners, pistons, connecting rods and oil pump.

Attachment 1582646

..and for good measure I threw on the alternator.....I'm finally starting to see the light at the end of the tunnel on this engine build...especially since the cylinder head is all ready to be re-assembled....(pics to follow)...

Attachment 1582648
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