Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk > Engine Tech

Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


Reply
 
Thread Tools Display Modes
Old 06-10-2020, 12:41 AM   #1
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Cam lobe wear


Hey all new to the SR game just bought a decently built project car and just got the engine out. I am noticing some strange wear on the hks camshafts, it doesn?t appear to be wearing evenly and a lot of the coating appears to be missing. it?s not scarred very heavily but it?s definitely not as smooth in some areas as others as I?m sure you can see in the pictures. is this going to be in oiling issue from the squirter?s, an oil change frequency issue, or all of the above? In your opinion how bad is the rest of the engine going to look from this and are these cams at all salvageable. Any help is greatly appreciated.


Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Sponsored Links
Old 06-10-2020, 05:24 AM   #2
S14rebuild
BANNED
 
Join Date: May 2019
Location: Florida-FAIL
Posts: 2,497
Trader Rating: (8)
S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild
Feedback Score: 8 reviews
Closer detailed pictures would help here,

Pull the camshaft and see the condition of the rocker arms...
S14rebuild is offline   Reply With Quote
Old 06-10-2020, 07:46 AM   #3
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,784
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
check if that rocker shim is still present...you can also check oil flow with cranking while valve cover is off
jedi03 is offline   Reply With Quote
Old 06-10-2020, 08:08 AM   #4
RalliartRsX
Post Whore!
 
Join Date: Apr 2006
Location: Maryland
Posts: 4,753
Trader Rating: (32)
RalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfection
Feedback Score: 32 reviews
So the hardened coating is gone on cylinder 1 and 3 intake side

Check shim/clearances. Those cams are borderline useless
RalliartRsX is offline   Reply With Quote
Old 06-10-2020, 09:36 AM   #5
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Yea it?s not looking ideal. I pulled the pan off to find the oil pickup screen was broken off the tube. Must have sucked s**t up and clogged a squirter. I?m praying that?s not the only place that was starved. Wishful thinking I know. Will know more once I pull it apart more tonight. Anybody got some hks 264 stage three cams? Lol
Hopefully the rockers aren?t toast. Not very hopeful on that


Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Old 06-10-2020, 09:39 AM   #6
RalliartRsX
Post Whore!
 
Join Date: Apr 2006
Location: Maryland
Posts: 4,753
Trader Rating: (32)
RalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfectionRalliartRsX is close to perfection
Feedback Score: 32 reviews
PS remove the shitty ass rocker stoppers. Anyone who says they built an engine and put those in have no fucking clue what they are doing. That's a good way to destroy pistons and valves vs just losing a rocker or shim

Those cams are whipped. I will also be checking the cam caps and bearings. If you had no pickup or broken screen, low oil pressure to the head will cause this issue as well. Or with no screen, a bunch of FOD just whipped the cams and various other bearings throughout the engine

Full tear down.....
RalliartRsX is offline   Reply With Quote
Old 06-10-2020, 09:51 AM   #7
S14rebuild
BANNED
 
Join Date: May 2019
Location: Florida-FAIL
Posts: 2,497
Trader Rating: (8)
S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild
Feedback Score: 8 reviews
That motor ran with no oil pressure.... its fucked...needs a 100% dissasembly. No if ands or buts....
S14rebuild is offline   Reply With Quote
Old 06-10-2020, 10:00 AM   #8
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by S14rebuild View Post
That motor ran with no oil pressure.... its fucked...needs a 100% dissasembly. No if ands or buts....

I was pulling apart for a full teardown anyways so it?s not any extra work. The cost however is much more extra than I was hoping. The pickup was still on, just the screen was broken off of it. I mean, if it had no oil pressure wouldn?t we think all lobes would appear like this, not so localized? Correct me if I?m out to lunch.


Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Old 06-10-2020, 10:08 AM   #9
S14rebuild
BANNED
 
Join Date: May 2019
Location: Florida-FAIL
Posts: 2,497
Trader Rating: (8)
S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild S14rebuild
Feedback Score: 8 reviews
Take a sample of the oil send it out or analysis...ull get your answer on motor condition/health and that will point u in the right direction.

I see at minimum full rebuild and possiable new head depending on the cam cap wear marks..
S14rebuild is offline   Reply With Quote
Old 06-10-2020, 01:32 PM   #10
Kingtal0n
Post Whore!
 
Kingtal0n's Avatar
 
Join Date: Jul 2005
Location: South Florida
Age: 38
Posts: 4,648
Trader Rating: (17)
Kingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond repute
Feedback Score: 17 reviews
Send a message via AIM to Kingtal0n
This is why if I went to do a rebuild, I would Only rebuild an engine that was healthy and been running for 100-200k miles.

If it ran fine, stock, and you rebuild before it has any issues, the chance of success is very high as long as you keep up with the corrections TSB bullshit (pickup oil tube issue is an old one) and avoid the machine shop and machine work.


If it ever ran into mechanical issues, lack of oil pressure for example, or odd wear, I would suspect that no matter what I do, it will always have that issue.
Now, that might not be true. However it saves me a LOT of headache and time trying to make the mistake of learning whether it is true or not.
Kingtal0n is offline   Reply With Quote
Old 06-10-2020, 02:06 PM   #11
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by Kingtal0n View Post
This is why if I went to do a rebuild, I would Only rebuild an engine that was healthy and been running for 100-200k miles.

If it ran fine, stock, and you rebuild before it has any issues, the chance of success is very high as long as you keep up with the corrections TSB bullshit (pickup oil tube issue is an old one) and avoid the machine shop and machine work.


If it ever ran into mechanical issues, lack of oil pressure for example, or odd wear, I would suspect that no matter what I do, it will always have that issue.
Now, that might not be true. However it saves me a LOT of headache and time trying to make the mistake of learning whether it is true or not.

That?s fair, it was a good deal for me so I expected to inherit some issues. Lots of expensive parts installed, only 75k miles on the body. Engine swapped from an s13 so mileage unknown. Hks cams- now roasted lol, dual valve spring set forged internals, upgraded sway bars GReddy full turbo kit. List goes on. Picked it up for 4K from a buddy who needed cash with a kid On the way, took it on as a project car as the shitty pigtailed maf fried the chipped ecu. Was hoping harness issues were the extent of my problems but I?m not afraid to do things properly. If I have to source another motor I?ll source another motor. Not new to rebuilds but I always reach out to the communities that frequent these builds as I?m unfamiliar with common issues surrounding engines I?ve never built myself. I appreciate your input


Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Old 06-10-2020, 07:53 PM   #12
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Update

Got the cams out, looking pretty good considering. Although I only had about 3 mins to look it over before baby woke up so will head out later tonight and continue to assess the damage in the bottom end. Let me know what ya think



Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Old 06-15-2020, 07:05 PM   #13
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,052
Trader Rating: (34)
jr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nice
Feedback Score: 34 reviews
Send a message via AIM to jr_ss
Nothing appears to be damaged (cam journals), however you’re valve lash was incorrect on cylinders. That is why you see uneven wear on the cams. I would mic the cam journals and see if there is a large discrepancy between the worn area and non. It “may” be salvageable.

Just ensure the shin heights are correct side to side on the rockers(individual ones).
__________________
My SR20VET
jr_ss is offline   Reply With Quote
Old 06-15-2020, 07:11 PM   #14
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by jr_ss View Post
Nothing appears to be damaged (cam journals), however you?re valve lash was incorrect on cylinders. That is why you see uneven wear on the cams. I would mic the cam journals and see if there is a large discrepancy between the worn area and non. It ?may? be salvageable.

Just ensure the shin heights are correct side to side on the rockers(individual ones).

I appreciate the insight. I will have the head and block st the machine shop next week for a hot tank and see if they can salvage the cams. But I will definitely be on the lookout for this now as I don?t need this happening. It looks like I will need intake new rockers tho, they?re pretty grooved


Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Old 06-16-2020, 06:21 AM   #15
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,052
Trader Rating: (34)
jr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nicejr_ss is just really nice
Feedback Score: 34 reviews
Send a message via AIM to jr_ss
People have gotten away with polishing them. You’d need thicker shims to accommodate any “machining”. Personally, I’d replace them with new ones and have the dual guide conversion done. Less chance of rockers kicking off at high RPM.
__________________
My SR20VET
jr_ss is offline   Reply With Quote
Old 06-16-2020, 10:18 AM   #16
Smashyourglass
 
Join Date: May 2020
Location: Canada
Age: 30
Posts: 9
Trader Rating: (0)
Smashyourglass is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by jr_ss View Post
People have gotten away with polishing them. You?d need thicker shims to accommodate any ?machining?. Personally, I?d replace them with new ones and have the dual guide conversion done. Less chance of rockers kicking off at high RPM.

I was just reading about that conversion, what?s the deal with that, seems simple enough however isn?t there a benefit in being able to adjust the valve lash?


Sent from my iPhone using Tapatalk
Smashyourglass is offline   Reply With Quote
Old 06-16-2020, 05:36 PM   #17
TheRealSy90
Premium Member
 
TheRealSy90's Avatar
 
Join Date: Mar 2009
Location: Maricopa, AZ
Age: 30
Posts: 7,679
Trader Rating: (10)
TheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant futureTheRealSy90 has a brilliant future
Feedback Score: 10 reviews
Quote:
Originally Posted by Smashyourglass View Post
I was just reading about that conversion, what?s the deal with that, seems simple enough however isn?t there a benefit in being able to adjust the valve lash?


Sent from my iPhone using Tapatalk
You can still set valve lash with dual guide shims if you order the additional guides in the right thickness or machine them to suit.
__________________
Quote:
Originally Posted by crimsonrockett View Post
Such a good signature.
TheRealSy90 is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 10:34 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
vB.Sponsors
Copyright © 1998 - 2019, Zilvia.net™