Recent Topics
CVT transmissions
by Gito
18 minutes 56 seconds ago
sunday newspaper paper price increase $2 to $3
by edwardh1
42 minutes 16 seconds ago
Tomatos and peppers
by Quattro Pete
48 minutes 39 seconds ago
Homemade yogurt + probiotics
by onetwoothreee
Today at 09:16 AM
ATF+4 in a Mercedes Transmission! Really?
by Tikka
Today at 09:12 AM
Porsche 75w90
by dgjks6
Today at 08:51 AM
02' Silverado 5.3L Differential oil (G80 Locker)
by Gito
Today at 08:09 AM
Removing a concrete sidewalk
by Oldtom
Today at 07:35 AM
ATF exchange using the cooler line
by ugabulldog
Today at 07:00 AM
High volume oil pumps?
by dlundblad
Today at 06:49 AM
Penrite LV ATF
by toyota62
Today at 01:30 AM
Valvoline MaxLife Full Synthetic Multi-Vehicle ATF
by glmtd
Today at 12:17 AM
Kendall GT1 euro
by Bullwinkle007
Today at 12:05 AM
$14 5qt. QS 10w-40 syn blend + $5 GC - wallys
by lairdwd
Yesterday at 09:06 PM
Synthetic from dino?
by S2K
Yesterday at 08:35 PM
Voltage fluctuation 2012 Elantra
by schuylkill
Yesterday at 08:28 PM
Tranfer Case 2016 GMC Sierra 1500 6.2 8 speed
by dareo
Yesterday at 07:39 PM
Caliper slide pin questions
by ZZman
Yesterday at 07:24 PM
Perfect Afternoon with F7Fs
by Yah-Tah-Hey
Yesterday at 06:10 PM
Blending E85 to use as cleaner in non-FFV
by ltslimjim
Yesterday at 05:33 PM
Newest Members
Brdftbll, NievesStefanor, Zervun, ppreedom, krugger
65527 Registered Users
Who's Online
73 registered (1JZ_E46, 2015_PSD, 93cruiser, 4WD, A310, 5AcresAndAFool, 8 invisible), 1643 Guests and 29 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65527 Members
67 Forums
287470 Topics
4795461 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 Offline


Registered: 01/27/11
Posts: 507
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 180k, Delvac 15w40, Wix 51315
2004 Corolla 190k, 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: 1586
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: 8301
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: 12037
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: 19138
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.

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: 6625
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 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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


Registered: 01/27/11
Posts: 507
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 180k, Delvac 15w40, Wix 51315
2004 Corolla 190k, VWB 5w20 + SSS 10w40, MGL4967

Top