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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Cooling System Leak

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    4/02/2019 1:48 PM  #26

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,250

    Re: Cooling System Leak

    rpm wrote:

    Yo Gary, I was looking over my pita oil leaking motor tonight, and saw this. It's like a club thing.

    We have to start electing positions. You can be Pres, I'll run for VP.....
     

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    4/02/2019 3:48 PM  #27

    50vert
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    From: QLD Australia
    Registered: 4/01/2013
    Posts: 1,428

    Re: Cooling System Leak

    Bob, ya probably know that the two large bolts at the rear of the pan don't go into blind holes, and need thread sealant .... but thought I'd mention it.

    "Those telephone poles were like a picket fence"
     

    4/02/2019 5:50 PM  #28

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,874

    Re: Cooling System Leak

    rpm wrote:

    Bullet Bob wrote:

    Bob;  Still leaking oil?  It's been two years since FWB.  Fix that sucker.  You gonna be bringing up the arse end again goin' to Clinton?  I mean, it's a SBF...how hard can it be to make it stop gushing oil?

    BB

    Ya, no kidding. Multiple rear seals, Felpro and Cometic, and the MS RTV only trick on the pan, 2 different brand one piece pan gaskets, and it still leaks.

    But it only makes a mess when driven at speed. I can idle it while parked, and even take it up to 2k rpm and it will only leak a minor amount, and minor leakage on the floor after shutting it off.



    When taken up to speed, the oil goes all over the headers and floor, and leaks a bunch after shutting it off. Those headers were freshly painted before taking it on a 10 mile run.



    I'm at my wits' end.

    IF we wuz'a talk'in Harley Davidson'ez this would be a perfectly normal situation.
    No worries mate! (thanx Barry)....this is why God made kitty litter...
    6s6
     

    Last edited by 6sally6 (4/02/2019 5:50 PM)

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    4/02/2019 7:13 PM  #29

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,299

    Re: Cooling System Leak

    Do you have proper pcv system installed?  Wonder if you have some blowby pressurizing the crankcase.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    4/03/2019 10:55 AM  #30

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
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    Re: Cooling System Leak

    HudginJ3 wrote:

    ....... trip around the big block I could hear ...........

    Was this a Freudian slip??  About time for an engine swap?
     

    John  -- 67 Mustang Coupe 390 5 speed
     

    4/03/2019 3:04 PM  #31

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,299

    Re: Cooling System Leak

    Symptoms of :
    Leaks only at higher RPM
    Leaks after shut off

    Could also be valve covers.

    Be aware of too long bolts bottom out before clamping down. Or bent valve cover.
    I cannot really see the pic well on my phone, but the rear pan seal showing globs of rtv in front of the primer gray block plate/inspection cover is a bit concerning.  If the rtv in the seal groove is applied like the excess that has oozed outward, that might be a big source of a leak. There is nearly a 1/4” of rtv that has to fill that groove 100% and has to mate with the pan 100%.  Obviously any gap will leak.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    4/03/2019 6:06 PM  #32

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 2,018

    Re: Cooling System Leak

    Well....you know the rear main has a slight leak, but I don't see how it will get to the headers from there. Is there oil on the back of the block where it mates with the intake? or valve covers? Is that oil hanging off the starter?

    What have you used for sealant? Ford used TA-31 on the truck diesel engines. The stuff holds great. Comes in a caulk tube, so break out the caulk gun for applying. Pick it up at the Ford dealer or online.

    John  -- 67 Mustang Coupe 390 5 speed
     

    4/03/2019 6:22 PM  #33

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,673

    Re: Cooling System Leak

    Thanks Steve. I thought about the valve covers and checked them already. I also thought it could be the Melling HV oil pump, so I changed it out to a standard pump.

    That primer gray look at the inspection cover is foot spray powder, but that rtv does look like crap. I'm pretty sure I error on the side of too much rtv, but we'll see when I pull the pan. The 2 previous times I pulled the pan with rtv as the only sealer, I had good coverage.

    Thinking I might have leakage past the rings causing excess pressure in the crankcase, I hooked up a vacuum/ pressure gauge to the valve cover and went for a spin. At idle the needle moved just into the vacuum side of zero, and maxed out at 1 inch of vacuum at full throttle. Cylinder pressure and leakage also checked out ok.

    I'm gonna pull the pan and rear main seal, check the run out on the rear main area of the crank, and go from there.

    Hey Gary, what do I owe you for stealing your thread?

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    4/03/2019 6:32 PM  #34

    HudginJ3
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    From: Cedar Hill, TX
    Registered: 4/29/2015
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    Re: Cooling System Leak

    Bolted to Floor wrote:

    HudginJ3 wrote:

    ....... trip around the big block I could hear ...........

    Was this a Freudian slip??  About time for an engine swap?
     

     
    I've got about as big a block as I'm going to get, --- on the inside. No more engine swaps in the near future, I hope. Working on trans swap.    Big block refers to city block instead of neighbor hood block. Nobody drives there Mustang around a little block.

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
     

    4/14/2019 7:06 PM  #35

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,673

    Re: Cooling System Leak

    MS wrote:

    I cannot really see the pic well on my phone, but the rear pan seal showing globs of rtv in front of the primer gray block plate/inspection cover is a bit concerning.  If the rtv in the seal groove is applied like the excess that has oozed outward, that might be a big source of a leak. There is nearly a 1/4” of rtv that has to fill that groove 100% and has to mate with the pan 100%.  Obviously any gap will leak.

     
    After resting a really painful lower back for a couple of weeks, I removed the oil pan today. Kinda hard to blame a rear seal leak with RTV applied like this. MS was spot on about the RTV filling the grove on the main cap.  I'm gonna have to give my head mechanic a woopin'.


    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

     

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