Dreaded block coolant drain plug removal/replacement
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Thread: Dreaded block coolant drain plug removal/replacement

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    Cunning Linguist Site Supporter My location tekenaar will become famous soon enough tekenaar's Avatar
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    Lightbulb Dreaded block coolant drain plug removal/replacement

    According to my search here, there are numerous threads discussing the dreaded "in-block" coolant drain plug removal and subsequent replacement.

    The plug is M14 x 1.5, metric pipe threaded and has a 3/8" square male head for removal . . . go figure!

    Here's my recommendations for proper removal and suggested replacement of this plug:

    First, go to Sears buy a Craftsman "3/8" 8-pt standard", 3/8" drive socket, PN 45792.

    Second, go to any Auto Parts store and purchase a 1/4" MIP (NPT) brass drain cock from their "HELP!" parts.

    Clean any gunk from around drain plug and warm up engine, then liberally spray PB Blaster around drain plug and let set until cool. When cool, use a "breaker bar", short extension and your new Sears socket to loosen that stubborn drain plug.

    Put drain plug aside as a "back-up", you'll replace it after the block drains with your brass coolant drain petcock, which has the benefit of now draining your block with a mere "twist of the wrist!"

    Last edited by tekenaar; 05-30-2008 at 09:21 AM. Reason: correct plug/hole sizing


    1960: '61 Rekord PII 1.7 3S 3.9 '69 Kadett LS 'sprint' 1.9 3A 3.18
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    Have Opel, Will Travel oldopelguy is on a distinguished road oldopelguy's Avatar
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    matrch?

    Curse me not being a mod, when the perfect opportunity presents itself!
    1958 Rekord Sedan, 1958 Olympia Wagon, 1959 Opel Olympia Sedan, 1967 Kadett Coupe, 1967 Admiral Sedan 4L CIH-6, 1968 Kadett fastback 1.1L, 1970 Kadett Wagon Turbo 2.2L, 1971 Kadett Sedan 1.1L, 1975 Manta Wagon 4.3L V-6

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    Cunning Linguist Site Supporter My location tekenaar will become famous soon enough tekenaar's Avatar
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    Red face OOPS! . . . wrong plug/hole size

    Quote Originally Posted by oldopelguy View Post
    Curse me not being a mod, when the perfect opportunity presents itself!
    You got me . . . spelling, that is . . . but I was also wrong about plug size, uh, thinking about the OP sender hole!
    Last edited by tekenaar; 05-29-2008 at 07:38 PM.


    1960: '61 Rekord PII 1.7 3S 3.9 '69 Kadett LS 'sprint' 1.9 3A 3.18
    1970: '70 GT 1.9 4S 3.44 '72 GT 2.2SSD 5S 3.44 '72 GT 2.4FI 5S 3.44P
    1970: '73 GT 1.9FI 4S 3.44 '75 1900 1.9FI 4S 3.44
    1980: '85 Bitter SC 3.9FI 5S 3.44P
    2000: '09 Solstice GXP Coupe 2.0 SIDI VVT "Stage 2" Turbo 5S 3.73P


    "De inimico non tantum loquaris male, sed cogites."

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    UFO pel investigator Site Supporter My location Aardvaark is on a distinguished road Aardvaark's Avatar
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    Second, go to any Auto Parts store and purchase a 1/4" MIP (NPT) brass drain petcock from their "HELP!" parts.

    Put drain plug aside as a "back-up", you'll replace it after the block drains with your brass coolant drain petcock, which has the benefit of now draining your block with a mere "twist of the wrist!"
    -----------------------
    Otto. Please refrain from using dirty words in your posts! This is suppose to be a family friendly site!

    On a serious note. You are showing a "drain cock" not a "drain petcock". Two
    different animals you know.
    Last edited by Aardvaark; 05-29-2008 at 11:41 PM.
    -Mark
    '75 Manta

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    Project 1450 supporter... Site Supporter My location RallyBob has a spectacular aura about RallyBob has a spectacular aura about RallyBob has a spectacular aura about RallyBob's Avatar
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    Quote Originally Posted by tekenaar View Post
    The plug is 1/4" MIP (NPT) threaded and has a 3/8" square male head for removal . . .
    In truth Otto, it's a metric plug, 14 mm pipe thread. BUT, it is SOOO close to 1/4" NPT they are virtually interchangeable. I've done it myself for many years.

    Bob
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    '70 GT 'Bonnie', '71 Ascona 4-dr turbo - winter beater, '71 Ascona 4-dr 'Turd' - rallycar, '72 Manta Rallye - hillclimb car, '72 Ascona wagon - 'Red', '72 Manta - caged street car, '73 Manta Luxus, '73 Ascona 2-dr, '74 Ascona 2-dr - Project X, '74 Manta Luxus - factory sunroof, '74 Manta ITB racecar, '75 Manta, '75 Sportwagon, '75 Manta - racecar

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    tomking My location tomking is on a distinguished road tomking's Avatar
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    So at least we now know that all of Ottos pets are males.
    TMK

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    Cunning Linguist Site Supporter My location tekenaar will become famous soon enough tekenaar's Avatar
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    Red face Comedy of errors!

    Quote Originally Posted by RallyBob View Post
    In truth Otto, it's a metric plug, 14 mm pipe thread. BUT, it is SOOO close to 1/4" NPT they are virtually interchangeable. I've done it myself for many years.

    Bob
    Oddly, that's - M14 x 1.5, actually - what I'd said originally, but then I second-guessed myself because I'd given the "drain cock" replacement size as being 3/8" MIP, which I realized was wrong . . . comedy of errors, it turns out!


    1960: '61 Rekord PII 1.7 3S 3.9 '69 Kadett LS 'sprint' 1.9 3A 3.18
    1970: '70 GT 1.9 4S 3.44 '72 GT 2.2SSD 5S 3.44 '72 GT 2.4FI 5S 3.44P
    1970: '73 GT 1.9FI 4S 3.44 '75 1900 1.9FI 4S 3.44
    1980: '85 Bitter SC 3.9FI 5S 3.44P
    2000: '09 Solstice GXP Coupe 2.0 SIDI VVT "Stage 2" Turbo 5S 3.73P


    "De inimico non tantum loquaris male, sed cogites."

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    Project 1450 supporter... Site Supporter My location RallyBob has a spectacular aura about RallyBob has a spectacular aura about RallyBob has a spectacular aura about RallyBob's Avatar
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    Quote Originally Posted by tekenaar View Post
    but then I second-guessed myself because I'd given the "drain cock" replacement size as being 3/8" MIP,

    Heh heh, you said 'drain'....
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    '70 GT 'Bonnie', '71 Ascona 4-dr turbo - winter beater, '71 Ascona 4-dr 'Turd' - rallycar, '72 Manta Rallye - hillclimb car, '72 Ascona wagon - 'Red', '72 Manta - caged street car, '73 Manta Luxus, '73 Ascona 2-dr, '74 Ascona 2-dr - Project X, '74 Manta Luxus - factory sunroof, '74 Manta ITB racecar, '75 Manta, '75 Sportwagon, '75 Manta - racecar

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    Behave y'all! You're acting like a flock of cockerels.

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    1/4" Drain Cock Caution

    Quote: The plug is M14 x 1.5, metric pipe threaded and has a 3/8" square male head for removal . . . go figure!

    Okay, I know you CAN use a 1/4" NPT fitting for this port, and it'll work so long as you put it in and leave it, but it's not correct, and will damage the threads in the block. The 1/4" NPT has 18 threads per inch, and is tapered, while the correct fitting has about 17 threads per inch (25.4mm per inch divided by the 1.5mm pitch) and is NOT tapered (parallel thread).

    The correct M14 X 1.5 fitting is also known as 1/4" BSPP (British Standard Pipe Parallel), or by its ISO designation: G 1/4".

    A replacement 1/4" G plug which takes a 6mm allen wrench can be had from Winco (J.W. Winco, Inc. - Threaded Pipe Plugs). I suspect a good industrial supply house would have a drain cock of the appropriate thread.

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    Opeler trlmr is on a distinguished road
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    I think he was using a brass petcock which I don't believe will damage cast threads and also shouldn't ever need too be removed to drain the block. But your point is a good one
    Quote Originally Posted by jjensen View Post
    Quote: The plug is M14 x 1.5, metric pipe threaded and has a 3/8" square male head for removal . . . go figure!

    Okay, I know you CAN use a 1/4" NPT fitting for this port, and it'll work so long as you put it in and leave it, but it's not correct, and will damage the threads in the block. The 1/4" NPT has 18 threads per inch, and is tapered, while the correct fitting has about 17 threads per inch (25.4mm per inch divided by the 1.5mm pitch) and is NOT tapered (parallel thread).

    The correct M14 X 1.5 fitting is also known as 1/4" BSPP (British Standard Pipe Parallel), or by its ISO designation: G 1/4".

    A replacement 1/4" G plug which takes a 6mm allen wrench can be had from Winco (J.W. Winco, Inc. - Threaded Pipe Plugs). I suspect a good industrial supply house would have a drain cock of the appropriate thread.

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    Project 1450 supporter... Site Supporter My location RallyBob has a spectacular aura about RallyBob has a spectacular aura about RallyBob has a spectacular aura about RallyBob's Avatar
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    Quote Originally Posted by trlmr View Post
    I think he was using a brass petcock which I don't believe will damage cast threads and also shouldn't ever need too be removed to drain the block. But your point is a good one
    In my case at least, your statement is correct. I use brass plugs/drains in the cast iron block. I've never hurt an Opel block in 25 years. Well, except for the occasional connecting rod parting company....
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    Just an old fart My location wrench459 will become famous soon enough wrench459's Avatar
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    Quote Originally Posted by RallyBob View Post
    Well, except for the occasional connecting rod parting company....
    What Bob didn't say is which rod should be tossed for proper crankcase ventilation.
    I've found the number four works the best.
    Who needs a scraper,windage tray when theres a big hole in the right hand side of the block. Tongue in cheek!
    Black Horse

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    Old Opeler My location GTJIM will become famous soon enough GTJIM's Avatar
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    pipe threads

    M14 x 1.5mm threads are NOT pipe threads. They are approx 17 TPI
    NTP 1/4 & 3/8 pipe thread is 18 TPI and BSP 1/4 & 3/8 pipe thread is 19 TPI - so the US pipe thread is actually closer to the Metric thread.

    However, I suspect that the water drain hole is a Metric pipe thread - which is very similar to BSP the 'British' Standard as the Metric System directly borrowed the british pipe thread system.

    With a brass NTP plug or 'petcock' it will (just about) screw into a BSP (or Metric Pipe) thread ONCE. I doubt that it would successfully screw into the M14 X 1.5 thread.

    The other option is to open out the block drain hole to the next pipe size up... and thread it NTP so that a (US) standard reducer can be used to fit the NTP petcock (that is the correct term for a small brass valve BTW!).
    Also usefull if the original thread has been damaged (by a Previous Owner - of course!).

    HTH
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    Have Opel, Will Travel oldopelguy is on a distinguished road oldopelguy's Avatar
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    Isn't 14x1.5 the standard thread for spark plugs? I remember some discussion about it on one of my motorcycle forums because Fumoto makes an oil pan drain valve in both 14x1.25 and 14x1.5mm. I needed one for my motorcycle and one for my MINI, and I had to try both on whichever was the first to get the valve because I didn't remember which was which.

    Either way, the Fumoto part number should be F-106 for 14x1.5mm, and that lists several VWs and all Honda/Acuras since '84 or so as applications, as well as all Hyundai, Kia, and Suzuki applications and most VW and Saab. That all means you should be able to go almost anywhere and pick up an oil drain plug and screw it right in.
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    Detroit,where my home was My location 2 Fast 4 U is on a distinguished road 2 Fast 4 U's Avatar
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    Quote Originally Posted by GTJIM View Post
    M14 x 1.5mm threads are NOT pipe threads. They are approx 17 TPI
    NTP 1/4 & 3/8 pipe thread is 18 TPI and BSP 1/4 & 3/8 pipe thread is 19 TPI - so the US pipe thread is actually closer to the Metric thread.
    As GTJIM said metric thread isn't used for pipe tread, but the M14 thread comes in 4 sizes of pitch:
    2.00 mm [standard pitch]
    1.50 mm
    1.25 mm
    1.00 mm

    Quote Originally Posted by GTJIM View Post
    The other option is to open out the block drain hole to the next pipe size up... and thread it NTP so that a (US) standard reducer can be used to fit the NTP petcock (that is the correct term for a small brass valve BTW!).
    Also usefull if the original thread has been damaged (by a Previous Owner - of course!).
    HTH
    Or an other option a coupling OD threaded M14 x 1,5 and ID or OD threaded with a common pipe thread.
    Last edited by 2 Fast 4 U; 08-30-2010 at 01:51 PM.
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