mechanical question

Submitted: Friday, Apr 11, 2008 at 18:22

ThreadID: 56547 Views:2402 Replies:6 FollowUps:11

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F4Phantom

I took my head off today (from my engine) because i thought I had a snapped timing belt, turns out the belt is not snapped but it is loose for some reason, anyway it caused piston and valve introductions. So I took the rocker rail off to change some rockers and pedestals (the things which hold the cam shaft in place), when I bolted it back on the cam shaft the pedestals are locking it in and not allowing it to turn, mainly the end one opposite the belt wheel. So no it seems the spacers which should allow clearance to stop the cam gripping to much are not working for some reason. Can anyone tell me what to do here? Much appreciated.

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Reply By: nowimnumberone - Friday, Apr 11, 2008 at 18:40

Reply By: howesy - Friday, Apr 11, 2008 at 18:40

Reply By: Member - David P (VIC) - Friday, Apr 11, 2008 at 18:57

Reply By: burnsy - Friday, Apr 11, 2008 at 19:18

Friday, Apr 11, 2008 at 19:18

Did you put the pedestals back in the same position they came from?Alternative if someone machines the head after it's warped & doesn't line bore the cam tunnel the cam shaft will seize up when bolted down.

AnswerID: 298022

Follow Up By: F4Phantom - Friday, Apr 11, 2008 at 19:25

Friday, Apr 11, 2008 at 19:25

yeah they are all in the same place, BUT I have put new (old) ones because some were cracked in half but the new ones are from the same position.

FollowupID: 564088

Follow Up By: burnsy - Friday, Apr 11, 2008 at 19:46

Friday, Apr 11, 2008 at 19:46

Know nothing about Pajero's
1. I assume that your talking about the caps that hold the camshaft onto the head?
2. if so do you know what flexigauge is?
3. you need to be careful when changing caps.

FollowupID: 564093

Follow Up By: F4Phantom - Friday, Apr 11, 2008 at 19:58

Friday, Apr 11, 2008 at 19:58

1. yes the caps which hold the cam to the head is what I am talking about.

2. no idea what a flexi guage is but i am about to look it up

3. I was about as careful as I suppose I could have been. It locked up on the good head when I tried to put everything back as it had been only one minute before as a test. Meaning, I took it to bits, put it all right back together and it locked up. Very strange.

FollowupID: 564094

Follow Up By: burnsy - Friday, Apr 11, 2008 at 20:23

Friday, Apr 11, 2008 at 20:23

looks like you need to talk to a engine builder because the first thing you need to do is establish cam shaft bearing clearance on all pedestals.
you use the flexigauge to measure this.
I assume that you have rocker arms so firstly remove these which leaves the camshaft free of any resistance.With the belt off you must be able to rotate the cam freely,
If not It must be binding on one or more bearing point.
This is where the flexigauge comes in to measure the clearance of the cam to bearings
Surely somebody can supply you with this spec & how to do it.
If you were near Brisbane I can put you onto someone reliable
Mike.

FollowupID: 564102

Follow Up By: F4Phantom - Friday, Apr 11, 2008 at 20:37

Friday, Apr 11, 2008 at 20:37

Thanks burnsy, say I find one area is binding then what? the flexiguage I imagine will tell me how much clearence to give, but what do you do to adjust the clearance? I have a manual with all NM and feeler clearances.

FollowupID: 564106

Follow Up By: burnsy - Friday, Apr 11, 2008 at 20:58

Friday, Apr 11, 2008 at 20:58

You will need to remove the head & get a engine machine shop to line bore & resize the tunnel.
But before you do this I suggest you get the camshaft checked for trueness also at the engineering shop.

FollowupID: 564110