User Login    
 + Register
  • Main navigation
Login
Username:

Password:


Lost Password?

Register now!
Fast Search
Slow Search
Google Ad



Browsing this Thread:   1 Anonymous Users



« 1 (2) 3 »


Re: A15 cam bearings
Just can't stay away
Joined:
2002/10/19 10:41
Group:
Registered Users
Posts: 74
Offline
Sorry I thought it was the front bearing that was scored. Agree with what lamb_daiquiri said - easy way to check is get a straight edge or ruler and place it on the journals - all the lobes should clear the straight edge. If not the lobes will score the bearings as you slide the cam down the cam tunnel. A bent cam would do this too but you would have issues getting it in and out if it were that bent. No doubt this damage was caused by a person and not the engine during running.

Posted on: 2017/2/12 23:00
Transfer the post to other applications Transfer


Re: A15 cam bearings
Home away from home
Joined:
2015/11/10 17:48
From Fort Worth, Texas
Group:
Registered Users
Posts: 213
Offline
I agree that the previous owner caused the damage. I disassembled the engine some time ago and carefully removed everything. I don't recall putting any kind of force on the camshaft when I pulled it out. The engine must of been rebuilt at some point which is when this happened? I received my Clevite bearings this weekend and taking them along with the block and cam to the machine shop. Will post when it's done.

I have another question related to crankshaft end play. It measured .003 in. while I was keeping leverage on the crankshaft which is a little tight. Haynes manual calls out .002 thru .006. Should I have my machine shop shave some of the thrust bearing or crankshaft, or just leave it as is?

Posted on: 2017/2/13 3:19
Transfer the post to other applications Transfer


Re: A15 cam bearings
Just can't stay away
Joined:
2016/7/22 12:39
From Biloela, Sunshine State
Group:
Registered Users
Posts: 85
Offline
If you relieve the leverage on the crankshaft and then measure it, does it keep the .003 in. gap? If it does I'd leave it; it's not right on the edge but close to it. Better than that too loose.

Posted on: 2017/2/14 2:45
Transfer the post to other applications Transfer


Re: A15 cam bearings
Moderator
Joined:
2001/5/3 7:04
From 48 North
Group:
Registered Users
Contentmaster
Usermaster
Posts: 31575
Offline
Quote:
crankshaft end play. It measured .003 in... Haynes manual calls out .002 thru .006
That's right in between the Haynes specs. I'd leave it be

Nissan spec is: 0.0020 to 0.0059 inch. Again .003 is between these figures

Posted on: 2017/2/14 3:01
Transfer the post to other applications Transfer


Re: A15 cam bearings
Home away from home
Joined:
2015/11/10 17:48
From Fort Worth, Texas
Group:
Registered Users
Posts: 213
Offline
Ok, got my block back with new cam bearings. Camshaft slid in there no problem and spun freely. My only concern is that he didn't line up 3 of the oil passageways 100%. And the outer bearing shows 2 oil passages but only one is lined up with a passageway hole. He said the block only had 1 oil passageway. Someone please tell me that is correct. And should I be concerned with several bearings not being lined up with the oil passageways?

Attach file:



jpg  cam.bearing1.jpg (136.16 KB)
20677_58a519911bdb3.jpg 720X960 px

jpg  cam.bearing2.jpg (135.63 KB)
20677_58a5199a1b35c.jpg 720X960 px

jpg  cam.bearing3.jpg (104.34 KB)
20677_58a519a306363.jpg 960X720 px

jpg  cam.bearing4.jpg (123.41 KB)
20677_58a519ac2bf65.jpg 960X720 px

jpg  cam.bearing5.jpg (111.40 KB)
20677_58a519b5c59b6.jpg 960X720 px

jpg  oil.passage1.jpg (31.09 KB)
20677_58a519e905277.jpg 405X540 px

jpg  oil.passage2.jpg (114.32 KB)
20677_58a519f5626c0.jpg 720X960 px

jpg  oil.passage3.jpg (105.48 KB)
20677_58a519fd1db5d.jpg 720X960 px

jpg  oil.passage4.jpg (122.64 KB)
20677_58a51a054cde7.jpg 720X960 px

jpg  oil.passage5.jpg (98.46 KB)
20677_58a51a0e15984.jpg 960X720 px

Posted on: 2017/2/16 3:19
Transfer the post to other applications Transfer


Re: A15 cam bearings
Just can't stay away
Joined:
2016/7/22 12:39
From Biloela, Sunshine State
Group:
Registered Users
Posts: 85
Offline
Well. The word dodgy is the first to come to mind. I'm not sure how bad a partial line up is but one that's completely off would be like running a gearbox without oil right?

Posted on: 2017/2/16 23:50
Transfer the post to other applications Transfer


Re: A15 cam bearings
Home away from home
Joined:
2015/11/10 17:48
From Fort Worth, Texas
Group:
Registered Users
Posts: 213
Offline
DD...do you know if the block has two oil passages for the front cam bearing? If so, a photo of that would be great to pass along to my machinist. Will the camshaft have sufficient oil with several oil passages being partially blocked? I was thinking to possibly use a dremel to grind out the cam bearing and then clean the block.

Posted on: 2017/2/20 2:16
Transfer the post to other applications Transfer


Re: A15 cam bearings
Moderator
Joined:
2001/5/3 7:04
From 48 North
Group:
Registered Users
Contentmaster
Usermaster
Posts: 31575
Offline
I do not know, never changed the cam bearings

These are the Sealed Power versions

Attach file:



jpg  SEALED POWER 1592M Camshaft Bearing Set.jpg (96.67 KB)
174_58aa56d28d46d.jpg 1000X632 px

Posted on: 2017/2/20 2:39
Transfer the post to other applications Transfer


Re: A15 cam bearings
Moderator
Joined:
2001/5/3 7:04
From 48 North
Group:
Registered Users
Contentmaster
Usermaster
Posts: 31575
Offline
Hmmm ... Not sure if Sealed Power's photo is correct. Other photos of 1592M show the wide front bearing with the two holes are offset

Perhaps it is to oil the cam (2nd hole is oil inlet into camshaft?)

The center bearing passes oil to the rocker shaft, it may also have two holes

Attach file:



jpg  1592M.jpg (7.00 KB)
174_58aa5bbc41aa4.jpg 259X194 px

Posted on: 2017/2/20 3:03
Transfer the post to other applications Transfer


Re: A15 cam bearings
Home away from home
Joined:
2015/11/10 17:48
From Fort Worth, Texas
Group:
Registered Users
Posts: 213
Offline
Well I have another A15 block sitting on the bench that is partially disassembled. I may end up taking off the timing gears and chain and slide out the cam to see what the front bearing looks like. Unless someone else has a block they are working on and can take a picture and post. Do you see oil starvation issues with partially obstructed oil passageways?

Posted on: 2017/2/20 4:11
Transfer the post to other applications Transfer



« 1 (2) 3 »



You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.

[Advanced Search]