Gen 5 Lifter Noise
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 25

Thread:
Gen 5 Lifter Noise

  1. #1
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default Gen 5 Lifter Noise

    Please help as i`m lost. Am working on a Gen 5 454 in a 1962 Chevy station wagon. When the present owner bought the car it had lifter noise at idle and worsened as rpm increased. The previous owner had installed a supposedly new cam, lifters and adjustable rocker arm studs. I tried adjusting the lifters at 1/2, 3/4 and 1 1/2 full turn down. Engine has constant 50# oil pressure at idle. There was no adjustment to made that would silence them. I decided that the lifters were at fault. Ordered a new Comp Cam XE274H-10 cam, (.552/.555 @ .050 230/236 sep. 110) lifters, matching springs, timing chain and stainless roller tip rockers. Got them all installed and still have the same noisy lifters. Theres no valve cover interference. The rocker studs aren`t marked on their sides and the rocker tips contact the valve stem correctly. This is a crate engine with no more than 5k miles. Could someone PLEASE give me some advise and guidance? With good oil pressure and all these new parts, i cannot imagine what the problem might be.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Gen 5 BBC are "net lash" valve train, and originally used shouldered studs that were ran all the way down and torqued. If this has been converted to screw in studs and adjusting nuts, the rocker must be changed as well. Are the rockers Gen rockers, or MKIV rockers?
    You can tell by looking at them and comparing them to a stock MKIV rocker. The slot is wider and the rocker ball has a larger hole than a MKIV rocker ball.
    If the rocker balls are the stock Gen rockers and balls, and you are using a stud conversion, that might me the source of your noise.

    EDIT: Never mind, I see you changes the rockers to SS rollers.

    Hopefully the previous owner didn't do something brainy like install oil restrictors in the back of the block.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
    Last edited by gn7; 09-18-2013 at 01:38 PM.

  4. #3
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default

    oil restrictors would be an excellent place to check if i didn`t know that they weren`t installed. engine ran good until the previous owner wanted a cam change. the rocker studs don`t have any contact markings at all. i`ve been told that drilling a very small hole in the plugs at the end of the lifter oil passages might let trapped air escape. anyone ever heard of that happening? i`m about ready to try anything. i`m open to any suggestions or questions.
    Last edited by Richard Till; 09-18-2013 at 06:28 PM.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member jimclauss's Avatar
    Join Date
    Jan 2011
    Location
    Mickleton, New Jersey
    Posts
    1,622

    Default

    Quote Originally Posted by Richard Till View Post
    oil restrictors would be an excellent place to check if i didn`t know that they weren`t installed. engine ran good until the previous owner wanted a cam change. the rocker studs don`t have any contact markings at all. i`ve been told that drilling a very small hole in the plugs at the end of the lifter oil passages might let trapped air escape. anyone ever heard of that happening? i`m about ready to try anything. i`m open to any suggestions or questions.
    the holes are in there to lube the chain not let air out

  7. #5
    Junior Member
    Join Date
    May 2009
    Location
    San Jose,Ca
    Posts
    14

    Default

    Quote Originally Posted by jimclauss View Post
    the holes are in there to lube the chain not let air out
    I have heard the exact opposite from respected builders. Supposedly GM added the holes to help purge air from the galleys during initial start up. I too would love to know if this would help with my noisy hydraulic roller.

  8. #6
    Senior Member andyc's Avatar
    Join Date
    Feb 2010
    Location
    Valley of the Winds
    Posts
    302

    Default

    Just a thought....you say installed a "supposedly" new cam. Could it be possible that this engine had issue before you got it? Is it ALL lifters or just on one side of the engine? Could this be a rear cam bearing issue? Could it slip/turn in it's bore and create oil starvation? I'm sure someone can comment on this theory.

  9. #7
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default

    I`m working on this station wagon for its present owner. It was bought by him knowing it had a problem. It ran fine for the previous owner until he had the cam changed and converted it to adjustable rockers. The new owner said, "Hell, I`ll just buy everything new and know the problem is fixed". I replied, "Yep, That outta do it". All of the parts above are new out of the box. They didn`t change a darn thing. The only hint i saw was that several of the rockers on both sides aren`t getting enough oil while others are getting plenty. Now guessing i need to study the oiling system on a gen 5. I don`t see any evidence pointing elsewhere. Can anyone think of a reason for only a few rockers on both sides not getting oil?
    Last edited by Richard Till; 09-18-2013 at 10:16 PM.

  10. #8
    Senior Member andyc's Avatar
    Join Date
    Feb 2010
    Location
    Valley of the Winds
    Posts
    302

    Default

    I'm not versed on the later blocks but the Mrk 4's had a pretty good oiling system and I would believe "if it works, don't fix it" should be fathered into the Gen 5 and fairly the same system. Does the engine look clean inside? Why the cam change? Do you have a manual oil pressure gauge? What does the gauge read at higher RPMS?

  11. #9
    Senior Member andyc's Avatar
    Join Date
    Feb 2010
    Location
    Valley of the Winds
    Posts
    302

    Default I stand corrected. Good read-might help. Oiling???

    The Gen V & VI blocks have the oil passageway alongside the cam and into the lifter valley instead of down the oil pan rail as on the Mark IV. The oil pans do not interchange between these blocks and in fact, the Gen V & VI use a one piece rear main seal and different oil pan then the Mark IV.
    Timing covers were changed between all three block configurations.

    The Gen VI uses a cam thrust plate, not the Mark IV. But the Gen V and Mark IV also have provisions to use this plate if a Gen VI cam was to be used.

    The oil filter boss on the Mark IV uses a bolt-in adapter with an oil pressure relief inside, while the Gen V & VI filters mate straight to the block with a screw-in adapter and push-in oil pressure relief valves into the block itself.
    Both Gen V & VI do not have a fuel pump boss, while the Mark IV does.
    The Gen VI lifter bores are longer/higher with a machined flat surface to accept the roller lifters and their retianers; Gen V and Mark IV blocks cannot use the Gen 6 roller lifter and would need aftermarket.

  12. #10
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,269

    Default

    Are you expecting the valve train to be as quiet as a flat tappet hydraulic? If so, you'll be disappointed. Hyd. roller valve trains have noise to them by nature. Lots of moving parts there. Some seem worse than others, but none the less. There may be a break in period for the new lifters where the valving needs to "seat". Also curious, what oil are you running?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  13. #11
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,269

    Default

    Quote Originally Posted by 496blazer View Post
    I have heard the exact opposite from respected builders. Supposedly GM added the holes to help purge air from the galleys during initial start up. I too would love to know if this would help with my noisy hydraulic roller.
    This is correct but there should be no air in the system after running for even a few minutes.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  14. #12
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,269

    Default

    Quote Originally Posted by Richard Till View Post
    Please help as i`m lost. Am working on a Gen 5 454 in a 1962 Chevy station wagon. When the present owner bought the car it had lifter noise at idle and worsened as rpm increased. The previous owner had installed a supposedly new cam, lifters and adjustable rocker arm studs. I tried adjusting the lifters at 1/2, 3/4 and 1 1/2 full turn down. Engine has constant 50# oil pressure at idle. There was no adjustment to made that would silence them. I decided that the lifters were at fault. Ordered a new Comp Cam XE274H-10 cam, (.552/.555 @ .050 230/236 sep. 110) lifters, matching springs, timing chain and stainless roller tip rockers. Got them all installed and still have the same noisy lifters. Theres no valve cover interference. The rocker studs aren`t marked on their sides and the rocker tips contact the valve stem correctly. This is a crate engine with no more than 5k miles. Could someone PLEASE give me some advise and guidance? With good oil pressure and all these new parts, i cannot imagine what the problem might be.
    What lifters and springs did Comp sell you with this cam? That's getting into "stout" territory for a hyd. roller cam.
    Last edited by scott foxwell; 09-19-2013 at 07:53 AM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  15. #13
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default

    I should have stated at the begining that this is not a hydraulic roller. Its a hydraulic flat tappet. I have no clue as to what it had originally. All this started when the first owner wanted a cam with a lope. The cam i removed was a .520 lift and 226/230 @ .050 The noise actually is worse since i installed all the new parts. The new springs on it now have 112 lbs. seat pressure at 1.900 height. It has rotators on every spring.

  16. #14
    Senior Member Josh@JBP's Avatar
    Join Date
    Mar 2008
    Location
    California
    Posts
    388

    Default

    Had a customer supply a set of BBC cal custom wanna be valve covers recently, the tops of the intake rockers were contacting the inside of the valve covers (stock replacement style rockers). Luckly the engine never ran as it was actual generating metal just rolling it through by hand. This is common an fords with moderate to high lift and cheap chrome covers.

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95