Dipstick jumping open under load.
08-02-2016, 03:28 PM
#1
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Car: 1991 Camaro RS yellow
Engine: was '91 V6, now '89 5.7/355 TPI
Transmission: 4 speed automatic
Axle/Gears: Moser 3.73 with zexel posi
Dipstick jumping open under load.
My dipstick pops up three inches, when I put the hammer down, no problem otherwise. Is this normal? Should there be an o-ring or some other fastener to lock down the dipstick? Engine is small block with dipstick on driver's side, 350 bored out to 355. Engine recently rebuilt, 700 miles on it. Oil pressure = 60 psi, till engine warms up; oil pump is new, same mileage. Tiny question, I know, but there it is. Saw the other posts on the subject, but puzzled.
Last edited by James Sutton; 08-02-2016 at 03:35 PM.
08-02-2016, 03:53 PM
#2
Re: Dipstick jumping open under load.
My dipstick pops up three inches, when I put the hammer down, no problem otherwise. Is this normal? Should there be an o-ring or some other fastener to lock down the dipstick? Engine is small block with dipstick on driver's side, 350 bored out to 355. Engine recently rebuilt, 700 miles on it. Oil pressure = 60 psi, till engine warms up; oil pump is new, same mileage. Tiny question, I know, but there it is. Saw the other posts on the subject, but puzzled.
08-02-2016, 05:12 PM
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Car: 1991 Camaro RS yellow
Engine: was '91 V6, now '89 5.7/355 TPI
Transmission: 4 speed automatic
Axle/Gears: Moser 3.73 with zexel posi
Re: Dipstick jumping open under load.
It's okay, unless I put the pedal to the floor.
08-02-2016, 05:39 PM
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Dipstick jumping open under load.
Yup, classic blowby...
There's 3 main places that can occur:
Of course there's the oddballs; holes in pistons, cracked castings, and so forth. Let's leave those aside for the time being.
There's 3 main places that can occur:
- Rings. Need I say more.
- Exhaust valve guides.
- Intake gaskets.
Of course there's the oddballs; holes in pistons, cracked castings, and so forth. Let's leave those aside for the time being.
08-03-2016, 05:12 PM
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Car: Yes
Engine: Usually
Transmission: Sometimes
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Re: Dipstick jumping open under load.
No, not necessarily: in most stock heads, there's an exhaust passage that passes through the intake gasket. If that part of the gasket fails, exhaust goes right into the crankcase.
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08-03-2016, 10:17 PM
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Car: '86 Bird, 96 ImpalaSS, 98 C1500XCab
Engine: LG4, LT1, L31
Transmission: 700R4, 4L60E, 4L60E
Axle/Gears: 3.73 Tors, 4.88 spool, 3.73 Eaton
Re: Dipstick jumping open under load.
oh yep....didnt think about that effect from crossovers and heat riser passages. Luckily all that crap is in my past!
08-13-2016, 04:59 PM
#9
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Car: 1991 Camaro RS yellow
Engine: was '91 V6, now '89 5.7/355 TPI
Transmission: 4 speed automatic
Axle/Gears: Moser 3.73 with zexel posi
Re: Dipstick jumping open under load.
A small o-ring on the top of the dipstick was missing. Bought a new dipstick; no problem now.
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