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12-15-2023, 12:52 PM
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#1 |
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Registered User
 Join Date: Dec 2023
Location: NorCal
Posts: 2
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Oil cap wtf?
My truck is new'ish to me, and I thought I worked through most of quirks but I came across a new one over the weekend. I went to top off my oil and realized the oil cap won't come off - it just spins in place.
I know I can add oil through the PCV, but what's the deal with the cap? Shouldn't I be able to remove it? Am I missing something or is this a sign of a bigger issue? I'll probably take the valve cover off to see what's holding the cap in place, but I figured I'd ask you all before I go that route. |
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12-15-2023, 01:09 PM
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#2 |
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Registered User
Join Date: Nov 2022
Location: Seattle, WA
Posts: 332
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Re: Oil cap wtf?
sounds odd to me. first, I'd pull up and turn at the same time - you should be able to feel where the release points are. Once identified, pry up gently
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'72 C10 Cheyenne SWB North Carolina truck for 50 years, 72k original miles, Medium/Hawaiian Blue, 3 owners - one for 40 years, garaged kept, original: sheetmetal, undercarriage, moldings, glass * * * New - engine rebuild at 65k in 2015, one repaint in 2010, new front bumper, houndstooth seat, carpet, 8 inch rally wheels on 275-60R-15, LED lighting. - Semper Paratus! |
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12-15-2023, 01:11 PM
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#3 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,649
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Re: Oil cap wtf?
Some oil caps will not twist off. They are like a big rubber plug that is flared out at the bottom a little to keep it in place. They can be a real bugger when the rubber starts to get hard
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12-15-2023, 01:15 PM
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#4 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,853
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Re: Oil cap wtf?
1971-72 generally used the push in/pull out rubber plug style oil cap. The 1967-70 used a twist cap.
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1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion..  1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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12-15-2023, 03:47 PM
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#5 |
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Registered User
Join Date: Jul 2008
Location: Eastern Oregon
Posts: 2,393
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Re: Oil cap wtf?
I see this is your first post, welcome to our world. Get a tiny flat screwdriver and gently insert it underneath the plug and pry up. They are at times difficult to remove. Do it a few times and you’ll figure it out…
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71 C-20 07 Magnum RT AWD |
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12-15-2023, 03:54 PM
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#6 |
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Registered User
Join Date: Dec 2023
Location: NorCal
Posts: 2
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Re: Oil cap wtf?
Thanks, guys. I'll keep at it and see if I can finesse it out without chewing it up,. The plug itself is hard like plastic, so I can't tell if it's rubber because the previous owner painted it to match the orange valve covers. It also seems brittle, so I'm wondering if the paint or clear coat reacted with the rubber and the previous owner just left it alone.
Here's a couple of pics in case that's helpful. |
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12-15-2023, 04:25 PM
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#7 |
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Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,144
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Re: Oil cap wtf?
Sure looks like the plain Jane push in style to me. The rubber is slightly flared out at the bottom, that's what holds them in. When they get old the rubber becomes like hard plastic. You're probably going to have to just pry it out.
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12-15-2023, 04:44 PM
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#8 |
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Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Oil cap wtf?
Why not pull the PCV out and boot if you need to add oil...
__________________
1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado... |
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12-15-2023, 04:51 PM
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#9 |
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Active Member
Join Date: Sep 2023
Location: randolph va
Posts: 161
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Re: Oil cap wtf?
Just buy a new oil cap, I expect you can pick one up at any parts place or
https://www.ebay.com/itm/18599941619...Bk9SR9zY7vONYw |
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12-15-2023, 04:54 PM
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#10 |
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Active Member
Join Date: Sep 2023
Location: randolph va
Posts: 161
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Re: Oil cap wtf?
if you get the old one out, it may not go back
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12-15-2023, 06:56 PM
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#11 |
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Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 354
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Re: Oil cap wtf?
Are those covers on the right sides? Maybe flipped? Wouldn't think they would put the oil cap under the a/c bracket. On my old covers the oil fill was on the drivers side closest to the firewall. It had a push in grommet that accepted the tall fill tube. Probably the same grommet for just a push in oil cap. Wish I still had the setup. I will if I ever find any stock valve covers. Also, you can buy new grommets. PS if you really hate the valve covers I'll give you my address. Such a nice guy.
Last edited by howzzzit; 12-15-2023 at 07:02 PM. |
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12-17-2023, 08:12 AM
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#12 |
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68 C10 Longbed
Join Date: Sep 2006
Location: Naples, Florida
Posts: 519
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Re: Oil cap wtf?
FWIW:
Yep those are the rubber push in style. Just remember when they get old and brittle the can break apart when trying to pry out. If this happens be sure no pieces fall into the valve cover, if pieces fall in you should remove the valve cover and get the hard plastic pieces out that will be laying around your rocker arms. |
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