HYDRO LOCK ADVISE NEEDED
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Laughing Gas
Joined: Apr 2009
Posts: 903
Likes: 9
From: melbourne beach, fl
HYDRO LOCK ADVISE NEEDED
Recently purchased a 97 psd that is complete and out of truck ,have yet to do compression test and had my starter into the local auto electric store here,starter was tested and no workie,ring gear would not engage,then pulled the cover off the lower end and found significant damage to the 4 wire windings of copper or brass ,2 that were completely burnt from thier original contact points.Also the longer piece with the magnet looking pieces on the outside also damaged.Guy there suggested hydro lock as a strong possibility.Not knowing much about the history of this engine,inspected heads and appears not be any bent pushrods.so turned crank by hand and that was smoothe.Feeler gauge on injectors had all of them @ .002 clearance .Soon to do compression as i fabricate the glow plug adapter piece this week.What would be any considerations of the effects of hydro lock?Really appreciate all those who contribute on this forum!!!!!!!!!!!!!
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
Soon to do compression as i fabricate the glow plug adapter piece this week.
Shouldn't be anything to fabricate for the GP system. unless your making a new spot for the GPR to relocate it.
And even if it was hydro locked, the pressure will eventually bleed down, you'll only know if it is hydro locked when it is first put together.
So, depending on how long the block has been sitting...
And yes, if you can turn by hand, then not hydro locked.
I'd do the compression test and see what you get.
I think it will tell you if you have a bent rod, which is what hydro lock does, bend the connecting rod.
Which will lower the compression. I could be wrong on that, but seems logical.
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Laughing Gas
Joined: Apr 2009
Posts: 903
Likes: 9
From: melbourne beach, fl
Just finished makeing the adapter for the compression tester.compression tester from harbor freight and only had a idi length fitting that seems impossible to affix next to the pushrod.So with the suggestion of fabricateing a grease gun hose piece that threads into the compression tester,will weld old hollowed out glow plug.Pretty easy to make.So ,help me to understand how the hydro lock process occurs ,is it from fuel passing on top of the piston from bad seals on the injector?If the process were explained as to how it occurs this might help me when it's injector rebuild time.Thanks again,Ronjon
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
Oil and fuel mix on top of the piston, to much will create a hydro lock, to much liquid in the combustion chamber.
Thus, when you crank the motor over, it locks up, if you keep cranking the motor, it will bend the connecting rod.
If you lock it up while turning it over, you just stop and let the pressure bleed down.
It eventually will, but, in all reality, IMO, you should pull the GP and release the pressure.
Thats why a lot of guys suggest turning the motor over after an injector swap with the glow plugs out to blow out the excess oil.
It can get far more complicated than that. some liquid in there wont cause the hydro lock, but to much will. If its not enough to cause the hydro lock, than the oil will just blow right out the tail pipe.
It's really stupid, but a problem of HEUI injectors. I'd rather have the HEUI system then deal with 800 dollar pencil injectors.
It's more complicated, but no chance of burning your motor up due to low oil. And its a good indication of when your oil is bad, engine starts to run like crud.
Thus, when you crank the motor over, it locks up, if you keep cranking the motor, it will bend the connecting rod.
If you lock it up while turning it over, you just stop and let the pressure bleed down.
It eventually will, but, in all reality, IMO, you should pull the GP and release the pressure.
Thats why a lot of guys suggest turning the motor over after an injector swap with the glow plugs out to blow out the excess oil.
It can get far more complicated than that. some liquid in there wont cause the hydro lock, but to much will. If its not enough to cause the hydro lock, than the oil will just blow right out the tail pipe.
It's really stupid, but a problem of HEUI injectors. I'd rather have the HEUI system then deal with 800 dollar pencil injectors.
It's more complicated, but no chance of burning your motor up due to low oil. And its a good indication of when your oil is bad, engine starts to run like crud.
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Laughing Gas
Joined: Apr 2009
Posts: 903
Likes: 9
From: melbourne beach, fl
Thanks much, then would i be correct in considering the injector o rings as the primary source if this?Or would it be more of an internal problem of the injector allowing too much fuel through the nozzle?whoever had this must have burned up the starter by continous cranking in hydro lock.Had the pan off and inspected the rods and everything seems to be in good shape,although soon to verify with the compression test.
Post Fiend
Joined: Feb 2009
Posts: 8,773
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From: Texas Coast
WET
Just another point--starters can also fry if they are wet started or worse if they are submerged in water and someone tried to start it.
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Logistics Pro
Joined: Oct 2008
Posts: 4,818
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From: Avilla, IN
Usually hydro lock happens when someone changes injectors and gets oil in the cylinder that way.
If the thing was low on oil and they cranked and cranked and cranked, that could ruin the starter.
If I were you and had the money with the engine out, I would replace every seal and o-ring on the thing.
If the thing was low on oil and they cranked and cranked and cranked, that could ruin the starter.
If I were you and had the money with the engine out, I would replace every seal and o-ring on the thing.
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Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
Yea. Do some new o-rings wherever you can.
dont listen to the guy at the parts store, most people dont even know a thing about PSD's.
Most of us around here only know certain parts, only 2 or 3 guys on here know the full deal, Tim, Cody, Rick and a few others.
Hydrolock wont ruin the starter. Over cranking will. The starter will crank though a hydrolock and bend a rod.
if you have had the pan off and all the rods look good and you can turn it over by hand, dont even worry about the hydrolock again. Unless you are changing injectors, or pulling them out, then make sure you suck the oil out with a vacuum pump before cranking it.
dont listen to the guy at the parts store, most people dont even know a thing about PSD's.
Most of us around here only know certain parts, only 2 or 3 guys on here know the full deal, Tim, Cody, Rick and a few others.
Hydrolock wont ruin the starter. Over cranking will. The starter will crank though a hydrolock and bend a rod.
if you have had the pan off and all the rods look good and you can turn it over by hand, dont even worry about the hydrolock again. Unless you are changing injectors, or pulling them out, then make sure you suck the oil out with a vacuum pump before cranking it.
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