scratched cylinder head
Thread Starter
Registered!!
Joined: Oct 2011
Posts: 156
Likes: 0
From: Brampton, Canada
Rep Power: 178 
scratched cylinder head
I was cleaning my cylinder head and I found this scratch. Can I install it like this or get it fix. I can barely feel it with my finger nail. Can some JB well on it? Thx
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 517 
Re: scratched cylinder head
I'm wondering about the machined finish more than that scratch.
The magnifier makes it appear rough as hell.
A MLS head gasket needs a relatively smooth surface to seal against. Look at the surface of the block deck for comparison.
The coating on the gasket can only compensate for so much imperfection in the surfaces.
Most MLS gaskets require a surface smoother than 40 Ra (240 Rz) for the gasket to seal properly, the finish on the head and block must be flatter and smoother than what has traditionally been required for composite gaskets.
The magnifier makes it appear rough as hell.
A MLS head gasket needs a relatively smooth surface to seal against. Look at the surface of the block deck for comparison.
The coating on the gasket can only compensate for so much imperfection in the surfaces.
Most MLS gaskets require a surface smoother than 40 Ra (240 Rz) for the gasket to seal properly, the finish on the head and block must be flatter and smoother than what has traditionally been required for composite gaskets.
Thread Starter
Registered!!
Joined: Oct 2011
Posts: 156
Likes: 0
From: Brampton, Canada
Rep Power: 178 Re: scratched cylinder head
Thanks, I will talk to another machine shop.
I have another question. Intake valve runners are different. One is bigger than the other one for the D17a2 head. See photos
Cylinder 1 intake valve #1
Cylinder 1 intake valve #2
I have another question. Intake valve runners are different. One is bigger than the other one for the D17a2 head. See photos
Cylinder 1 intake valve #1
Cylinder 1 intake valve #2
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 517 Re: scratched cylinder head
Because God invented it that way?
EDIT: Was that head resurfaced or is that the original finish?
EDIT: Was that head resurfaced or is that the original finish?
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 517 
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
Harding12390
Mechanical Problems/Vehicle Issues and Fix-it Forum
2
Apr 6, 2018 11:43 AM
robbie374
Electrical, Wiring, and In Car Entertainment
4
Jul 7, 2015 02:56 AM
Wankenstein
Mechanical Problems/Vehicle Issues and Fix-it Forum
159
Jul 5, 2015 09:54 PM
Wankenstein
Mechanical Problems/Vehicle Issues and Fix-it Forum
10
Jun 2, 2015 11:54 AM
