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Camshaft Profile Question #4586246
11/27/17 04:07 AM
11/27/17 04:07 AM
Joined: May 2005
Posts: 2,202
Toronto, Canada
George7941 Offline OP
George7941  Offline OP
Joined: May 2005
Posts: 2,202
Toronto, Canada
I did a valve clearance adjustment on a Caterpillar C7 inline 6 truck engine. Firing order is 153624. I thought I had the engine at TDC at the end of the exhaust stroke for cyl 1 to adjust 1I&E, 2I, 3E, 4I and 5E. I found out later that I had not turned the engine over enough, the engine was only half way through its exhaust stroke and I was off by 90 deg/quarter turn. Similar situation for the second half of the valve adjustment when I thought I had TDC for cyl 6.

Do I need to pull the valve cover off again and recheck? Engine sounds normal now with no clatter indicating excessive lash.


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Camshaft Profile Question [Re: George7941] #4586250
11/27/17 04:17 AM
11/27/17 04:17 AM
Joined: Dec 2016
Posts: 6,259
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,259
Waco, TX
Originally Posted By: George7941
the engine was only half way through its exhaust stroke


You might be fine, butt he ONLY way to be sure is check the valve lash again.

Trust, but verify.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Camshaft Profile Question [Re: George7941] #4586261
11/27/17 05:24 AM
11/27/17 05:24 AM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
Setting valves by the TDC method is too troublesome - set them on the back of the cam...so when No6 inlet is wide open, set No1 inlet, and so on. You can still set 2 valves at once because there will always be another valve nearly fully open. If you get confused, mark each valve you set.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Camshaft Profile Question [Re: George7941] #4586320
11/27/17 08:23 AM
11/27/17 08:23 AM
Joined: Jul 2016
Posts: 1,482
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline
Joined: Jul 2016
Posts: 1,482
Jacksonville, FL
I would absolutely 're check the lash.

I learned how to lash valves quickly and easily from a friend who used to crew a fuel funny car. The method works on any 4 cycle engine.

Start on cylinder #1 rotate the engine until the exhaust valve just starts to open, once the exhaust valve just starts to open, adjust the intake valve on the same cylinder.

Continue to rotate the engine over, once the intake valve has fully opened and just starts to close, adjust the exhaust valve on that cylinder.

Now cylinder #1 is done.

Repeat process for the remaining 5 cylinders.

The beauty of this method is that it works regardless of firing order and you can start on any cylinder. It's how I've lashed valves for at least 20 years now.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Camshaft Profile Question [Re: George7941] #4586492
11/27/17 12:12 PM
11/27/17 12:12 PM
Joined: Sep 2004
Posts: 7,530
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,530
Marshfield , MA
Re- check. It isn't the noisy ones that burn.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Camshaft Profile Question [Re: FlyNavyP3] #4586649
11/27/17 03:01 PM
11/27/17 03:01 PM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
Originally Posted By: FlyNavyP3

Start on cylinder #1 rotate the engine until the exhaust valve just starts to open, once the exhaust valve just starts to open, adjust the intake valve on the same cylinder.

Continue to rotate the engine over, once the intake valve has fully opened and just starts to close, adjust the exhaust valve on that cylinder.


That's how I do single cyls, if I can't see the cam itself. But apart from triples and V twins, multi cyl engines will have one cyl 360 degrees firing from another cyl, so these ones are easy to do with the valve opening method - just so much easier to flick the engine over on the starter, see a valve fully open and adjust it's opposite number.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Camshaft Profile Question [Re: Silk] #4586768
11/27/17 04:48 PM
11/27/17 04:48 PM
Joined: Mar 2016
Posts: 1,425
Western S.C. since 1996
CR94 Offline
CR94  Offline
Joined: Mar 2016
Posts: 1,425
Western S.C. since 1996
Originally Posted By: Silk
... But apart from triples and V twins, multi cyl engines will have one cyl 360 degrees firing from another cyl, so these ones are easy to do with the valve opening method -...
Apart from 5-cylinder engines, too.


2011 Toyota Prius now at 92K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Camshaft Profile Question [Re: George7941] #4586830
11/27/17 06:29 PM
11/27/17 06:29 PM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
7, 9, 11.....


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Camshaft Profile Question [Re: andyd] #4586964
11/27/17 08:43 PM
11/27/17 08:43 PM
Joined: May 2005
Posts: 2,202
Toronto, Canada
George7941 Offline OP
George7941  Offline OP
Joined: May 2005
Posts: 2,202
Toronto, Canada
Thanks for all the feedback. I will recheck valve lash.

Originally Posted By: andyd
Re- check. It isn't the noisy ones that burn.

No risk of burning from my error. There is a possibility of excessive lash, no risk at all of insufficient lash.


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Camshaft Profile Question [Re: George7941] #4587114
11/27/17 11:56 PM
11/27/17 11:56 PM
Joined: Dec 2016
Posts: 6,259
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,259
Waco, TX
I have always used charts very similar to this one:


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Camshaft Profile Question [Re: Linctex] #4587164
11/28/17 03:42 AM
11/28/17 03:42 AM
Joined: May 2005
Posts: 2,202
Toronto, Canada
George7941 Offline OP
George7941  Offline OP
Joined: May 2005
Posts: 2,202
Toronto, Canada
Oops! I made a mistake in my original post. It should have been "I thought I had the engine at TDC at the end of the COMPRESSION stroke for cyl 1---".

Linctex's chart shows the exact way I did it.


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

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