Recent Topics
ATP At-216 Synthetic atf
by RdSnake
04/23/18 12:25 PM
Mann-Filter HU 711/51 X (cartridge) C&P
by 1JZ_E46
04/23/18 12:24 PM
Pennzoil Warranty
by Isophix
04/23/18 12:08 PM
buying oil.. question
by Dymblos
04/23/18 11:40 AM
Recommend me a UV light for AC dye leak detection
by zzyzzx
04/23/18 11:32 AM
2004 Toyota Sienna overheating
by Rtstrider
04/23/18 11:29 AM
Milesyn SB 10W30 API GF-5/SN, Synthetic Blend ?
by Quickman28
04/23/18 11:28 AM
Looking at a Hybrids as the main Family Hauler
by FutureDoc
04/23/18 10:54 AM
naturally aspirated cars left?
by flinter
04/23/18 10:31 AM
1989 Mercedes 300E
by jxthomps
04/23/18 10:07 AM
Just what we need, another Redline 5w30 VOA
by UG_Passat
04/23/18 09:54 AM
Electric Pressure Washer Recomendations
by Egg_Head
04/23/18 09:50 AM
VW Jetta 5 cylinder cartridge oil filter
by troyken
04/23/18 09:48 AM
Mailing in to Blackstone?
by 07titan
04/23/18 09:43 AM
Cameras With Film
by BlueOvalFitter
04/23/18 09:29 AM
Dipstick Tube on 4.6L
by Ifixyawata
04/23/18 08:48 AM
Starting Issues
by coopns
04/23/18 08:48 AM
3D pistons
by supton
04/23/18 08:39 AM
Replaced the high pressure fuel pump on my GTI
by skyactiv
04/23/18 08:08 AM
Fumoto is IN
by Kira
04/23/18 07:59 AM
Newest Members
BradPeterson, daylateetc, Kjammer, sonnyk, PWMDMD
64821 Registered Users
Who's Online
101 registered (andyd, 2010Civic, AlaskaMike, aquariuscsm, 1JZ_E46, 10 invisible), 1694 Guests and 36 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
64821 Members
68 Forums
282189 Topics
4711209 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4674266 - 02/22/18 11:14 AM How much liquid is needed to hydrolock an engine?
zorobabel Online   content


Registered: 01/27/11
Posts: 437
Loc: Anaheim, CA
Lets say you do a piston soak on a 2L 4 cylinder engine.
After the soak is done (assuming liquid is still pooling on top the pistons), the engine is slanted so the liquid pools to one side and the liquid is vacuumed out using 1/4" tubing. Little liquid is left pooling on the slated piston tops. Do you think this is enough to hydrolock the engine?
I've seen it mentioned to crank the engine after the soak with plugs, coils and injectors removed/disconnected; I've done that once and I got some mist out, but I wonder if it is really necessary.
_________________________
1997 Maxima 175k, Delvac 15w40, Wix 51315
2004 Corolla 189k, VWB 5w20 + SSS 10w40, MGL4967

Top
#4674272 - 02/22/18 11:20 AM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
WyrTwister Offline


Registered: 01/13/13
Posts: 1245
Loc: Texas
Do not know if it is necessary , but that is pretty much what I would do .
_________________________
Wyr
God bless

Top
#4674277 - 02/22/18 11:23 AM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
mrsilv04 Offline


Registered: 12/08/06
Posts: 8150
Loc: Illinois
I'd crank it with the plugs out, just for the peace of mind. Then you know.
_________________________
2004 Silverado - on its 3rd Jasper engine in less than one year.

Top
#4674278 - 02/22/18 11:23 AM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11846
Loc: N.H, U.S.A.
Depends on CC size, ring tension, valve overlap.

I wouldn't worry with a slow starting crank. More an issue of ingesting junk like "seafoam" at 2500 rpm too quickly.

If you are doing a soak you SHOULD pull the plugs. You don't want to force crusty junk down past the ringlands or trash your plugs.


Edited by ARCOgraphite (02/22/18 11:24 AM)
_________________________
2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

Top
#4674289 - 02/22/18 11:26 AM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
RLS Offline


Registered: 02/03/17
Posts: 25
Loc: Tennessee
When the the volume of the liquid exceeds the volume of the combustion chamber at top dead center you may have hydro lock. Now since pure liquid cannot be compressed other weaker parts may give way. A head gasket may push out, a rod may bend, the crankshaft may bend, a main bearing may compress. I have seen the crankshaft pushed out the bottom of the engine, splitting the block in the progress. It all depends on the amount of torque applied. If you are turning it over by hand and you feel it lock, rotate it backward and the fluid should be expelled out the exhaust. I have had my mechanics bend rods on Cummins engines after injector replacement because they got in a hurry. take your time and you should be ok.
_________________________
Robert - Retired Fleet supervisor and x-drag racer
Current Competitive shooter and trainer.

Top
#4674323 - 02/22/18 11:45 AM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
MolaKule Offline


Registered: 06/05/02
Posts: 18945
Loc: Iowegia - USA
Originally Posted By: zorobabel
Lets say you do a piston soak on a 2L 4 cylinder engine.
After the soak is done (assuming liquid is still pooling on top the pistons), the engine is slanted so the liquid pools to one side and the liquid is vacuumed out using 1/4" tubing. Little liquid is left pooling on the slated piston tops. Do you think this is enough to hydrolock the engine?
I've seen it mentioned to crank the engine after the soak with plugs, coils and injectors removed/disconnected; I've done that once and I got some mist out, but I wonder if it is really necessary.


Always clean the plug wells to remove any crud before removing plugs.

Always remove all the plugs when doing a soak (preferably overnight, and moving the crank by hand a couple of times).

After a soak, it is always a good idea to siphon out as much liquid as possible.

Cranking the engine with plugs still removed helps to expel any liquid not siphoned and avoids hydrolock.

LCD's, LC20 is still my favorite piston soak liquid.
_________________________
Hatito Hakiwisilaasamamo Waswasimamo Howisiwapani - Shawnee for: "Hello," "Good Morning," and "here's hoping you feel good." smile

Top
#4674582 - 02/22/18 03:07 PM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
LeakySeals Offline


Registered: 02/18/11
Posts: 6517
Loc: Hudson, NH
Whatever you put in is going to seep past the rings over time. If you are concerned just wait a day. Most if not all will be gone.
_________________________
06 Escalade 6.0L AWD 155k. M1 EP 5w30 Fram TG
03 Maxima 3.5L Unknown miles ST 10w30

Top
#4675442 - 02/23/18 12:12 PM Re: How much liquid is needed to hydrolock an engine? [Re: zorobabel]
zorobabel Online   content


Registered: 01/27/11
Posts: 437
Loc: Anaheim, CA
Thanks for the replies and tips!
I was hoping for a clear answer or at least a post from someone that started the engine after a soak and vacuum without cranking the plugless engine first.


Edited by zorobabel (02/23/18 12:23 PM)
_________________________
1997 Maxima 175k, Delvac 15w40, Wix 51315
2004 Corolla 189k, VWB 5w20 + SSS 10w40, MGL4967

Top