-
1.6TD head components
by
Huc
on 12 Dec, 2018 22:35
-
I'm putting back my 1.6TD (MF) head back together and I don't remember the orientation of the components. Does the lower spring seat go on first or the valve seal?
Thank you!
-
#1
by
Huc
on 12 Dec, 2018 22:45
-
This is the gasser 8v orientation as per Bentley
https://imgur.com/0N5e6t9This is the diesel 8v orientation as per Bentley
https://imgur.com/hqYPKP3Seems odd that they would be different, which orientation is correct?
Mine is a late year TD with the hydraulic lifters by the way.
-
#2
by
ORCoaster
on 12 Dec, 2018 23:06
-
Isn't the lower spring seat inside diameter larger than the valve seal? If not then I would be for putting it on then installing the seal to keep from messing it up. I think the last kit I got for seals had some hard plastic tips that went on the valve guides to keep from cutting up the inside of the seal.
The springs should be large enough to go over the seal and not cut into them.
Been a while since I did the head rebuild thing. Memory is going as I am cramming too much new info in the confined space all the time.
-
#3
by
libbydiesel
on 12 Dec, 2018 23:18
-
The valve spring seat should go on first.
-
#4
by
Huc
on 12 Dec, 2018 23:23
-
Isn't the lower spring seat inside diameter larger than the valve seal? If not then I would be for putting it on then installing the seal to keep from messing it up. I think the last kit I got for seals had some hard plastic tips that went on the valve guides to keep from cutting up the inside of the seal.
The springs should be large enough to go over the seal and not cut into them.
Been a while since I did the head rebuild thing. Memory is going as I am cramming too much new info in the confined space all the time.
The inside diameter of the lower seat is smaller than the valve seal (it doesn't pass through). The seals I ordered didn't come with any plastic tips to go between the seal and the guides.
-
#5
by
Huc
on 12 Dec, 2018 23:24
-
The valve spring seat should go on first.
Yeah that's what I thought too, but the manual's diagram got me doubting myself.
-
#6
by
libbydiesel
on 12 Dec, 2018 23:41
-
The plastic caps go over the ends of the valve stems not the guides. Just be gently in moving the seals over the valve stems and it should be fine.
-
#7
by
Huc
on 12 Dec, 2018 23:49
-
The plastic caps go over the ends of the valve stems not the guides. Just be gently in moving the seals over the valve stems and it should be fine.
For the valve stems, I just used a drinking straw to protect the seals from getting torn up by the grooves.
-
#8
by
Huc
on 12 Dec, 2018 23:51
-
Is a special tool required to push the valve seal tightly onto the guide? Using just my finger I can't push it down far enough. I've read people suggesting the use of a deep socket, but I'm worried that the rubber seal will be damaged that way. Is it fine to use a deep socket to press on the seal to seat it fully onto the valve guide?
-
#9
by
ORCoaster
on 13 Dec, 2018 11:59
-
-
#10
by
libbydiesel
on 13 Dec, 2018 17:49
-
I've always used an appropriately sized socket.
-
#11
by
libbydiesel
on 13 Dec, 2018 19:33
-
To be clear, I use a socket that is sized so that it is larger than the center rubber seal lip size. It should go around that and push only on the metal reinforced outer ring.
-
#12
by
Huc
on 13 Dec, 2018 22:49
-
Awesome, thanks everyone!
-
#13
by
Huc
on 15 Dec, 2018 04:32
-
I lapped all my valves with some grinding compound a few weeks ago when I first got my head out. After lapping all the valves, I noticed the exhaust valves had excessive play. I replaced all the exhaust valves.
Recently I have finished cleaning the head out and installing all the valves and springs, lifters back in. The thought just occurred to me...should I have lapped the valves again, now that the exhaust valve guides have been replaced?
Would it make a difference to how the valve sits on the seats, now that the exhaust valves no longer have the play it used to have? Thank you.
-
#14
by
libbydiesel
on 22 Dec, 2018 23:43
-
It can change the sealing of the valve. Always good to lap them to check.