Fitting exhaust after removing pre cats

[roseytvr]

Chaps

I will have the pre cats out at the weekend and will be refitting manifolds, Y piece and exhaust. A bit of advice on a number of issues.

1 Manifolds - I have new gaskets and ARP bolts. I need to clean the face on the block and manifold, do I just use wire wool to do that?
2 Lambda sensors - do I clean these whilst they are out, if so what with?
3 I will use exhaust gasket compound fitting the manifold to the head - what do I use fitting manifold to Y Piece?
4 Y Piece to exhaust - do I just grease this joint?

Any advice gratefully accepted!!
Ian

[BliarOut]

I lightly dress the joint faces with a flat file and wire wool then Iuse Firegum on everything except the manifold faces.

Top tip, use a ratchet luggage strap to pull the manifolds onto the Y piece.

[Johno]

roseytvr said:

Chaps

I will have the pre cats out at the weekend and will be refitting manifolds, Y piece and exhaust. A bit of advice on a number of issues.

1 Manifolds - I have new gaskets and ARP bolts. I need to clean the face on the block and manifold, do I just use wire wool to do that?
2 Lambda sensors - do I clean these whilst they are out, if so what with?
3 I will use exhaust gasket compound fitting the manifold to the head - what do I use fitting manifold to Y Piece?
4 Y Piece to exhaust - do I just grease this joint?

Any advice gratefully accepted!!
Ian

1 - Yes, files, wire brush, wire wool, wet & dray
2 - No, leave em alone as you may contaminate them. They're fine.
3 - Use exactly the same stuff
4 - I only grease inside the clamp, use assembly paste or gun gum on the actual joint
5 - Also grease the Y piece to main exhaust

[roseytvr]

Thanks Johno - all taken in. The only reason I ask re Lambda sensors is they got soaked with WD 40 getting them out. Is this likely to cause a problem?

[Pupp]

Files on the head?

A careful (and I mean careful) scrape of ally surfaces with a new stanley blade is me...

[spend]

Plenty of thinners/paraffin to get the old st off, if its really bad I have used a flap wheel gently. I really don't like scraping its just too easy to scratch.

Blasting with ally oxide brings the things up a treat, but not very good on bouncy sealant hence I normally dose with solvent first and the stuff brushes off after a soak.

Check flanges & heads for flatness with a straight edge once cleaned up. You never know if some plumber type has previously owned the car

[BliarOut]

Pupp said:

Files on the head?

A careful (and I mean careful) scrape of ally surfaces with a new stanley blade is me...

I use files on anything, but my first job as an apprentice was to file 1mm off a square steel block while keeping it flat and square. Time allowed, 40 hours!

[wycoller]

BliarOut said:

Pupp said:

Files on the head?

A careful (and I mean careful) scrape of ally surfaces with a new stanley blade is me...

I use files on anything, but my first job as an apprentice was to file 1mm off a square steel block while keeping it flat and square. Time allowed, 40 hours!

remove heads studs use surface plate and micrometer blue then scraper to achieve 95%contact
just kidding
stanley knife blade lightly scrape is suffucient
files should not be necessary okay in skilled hands

[Pupp]

BliarOut said:

Pupp said:

Files on the head?

A careful (and I mean careful) scrape of ally surfaces with a new stanley blade is me...

I use files on anything, but my first job as an apprentice was to file 1mm off a square steel block while keeping it flat and square. Time allowed, 40 hours!

Hope your boss came to like you eventually, but can see why he would do that...

[BliarOut]

Pupp said:

BliarOut said:

Pupp said:

Files on the head?

A careful (and I mean careful) scrape of ally surfaces with a new stanley blade is me...

I use files on anything, but my first job as an apprentice was to file 1mm off a square steel block while keeping it flat and square. Time allowed, 40 hours!

Hope your boss came to like you eventually, but can see why he would do that...

Twenty eight of us all aged sixteen filing away furiously, and not a piece of Foolscap in sight

[Pupp]

BliarOut said:

Pupp said:

BliarOut said:

Pupp said:

Files on the head?

A careful (and I mean careful) scrape of ally surfaces with a new stanley blade is me...

I use files on anything, but my first job as an apprentice was to file 1mm off a square steel block while keeping it flat and square. Time allowed, 40 hours!

Hope your boss came to like you eventually, but can see why he would do that...

Twenty eight of us all aged sixteen filing away furiously...

Ah, was that what it was called way back then?

[BliarOut]

I think they'd call it child abuse these days