Bad blowby on my 93 hdj81. Would anyone know any mechanics that can fix this in socal. Called almost every shop. At this point should i do it myself or swap it with a crate motor. I have no idea how to rebuild an engine.
Bad blowby?
- Thread starter sk1nnypanda
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I am not intimately familiar with the Toyota diesels, but I know a few things about diesels in general.
How are you determining blowby?
Does it use(burn) a lot of oil?
If you have blowby out the engine breather, but oil is not being burned that can points to a blown headgasket, not bad rings.
How are you determining blowby?
Does it use(burn) a lot of oil?
If you have blowby out the engine breather, but oil is not being burned that can points to a blown headgasket, not bad rings.
- Thread starter
- #3
i just tested it by placing oil cap on top of where it goes without screwing down. It also loses a lot of power and smells as if something is burning with white smoke coming out the exhaust. It also is leaking oil somewhere. All happened when i was moving from Louisiana to california. All temperatures seemed normal by my gauges, but i was going up-hill towing a motorcycle driving for 4hrs
mudgudgeon
Resident galah
Burnt oil will give you blue smoke, that stinks of oil.
White smoke is often the result of bad injection, could be ass simple a air getting into the fuel system. EXTREMELY common with hdj81 as rubber ages, hardens and cracks.
White smoke can also be due to burning coolant. Exhaust will smell sweet and acrid if burning coolant.
Another thing that can cause oil consumption is a restrictive catch can. Does yours have a catch can on the rocker cover breather/PCV hose?
Your test for blow by is gues work at best. Rebuilding a 1HD-T based on that could see you spend $10k solving a problem you don't have.
How many miles has the engine done?
Blow by is not a big issue with these engines. They are known to do 1/2 million km without being touched.
Head gasket failure is also not something they are known for.
I would recommend a couple of things
1.
do some reading in the diesel tech section of the forum.
Particularly about air in fuel lines, stumble, or running rough.
Also search for threads about blow by, catch cans, and oil consumption.
2. Send a used engine oil sample off to Blackstone for analysis. The analysis will tell you if you have coolant in the oil ( head gasket failure). It can also tell you if you have any bearing metal in oil which indicates excessive wear.
White smoke is often the result of bad injection, could be ass simple a air getting into the fuel system. EXTREMELY common with hdj81 as rubber ages, hardens and cracks.
White smoke can also be due to burning coolant. Exhaust will smell sweet and acrid if burning coolant.
Another thing that can cause oil consumption is a restrictive catch can. Does yours have a catch can on the rocker cover breather/PCV hose?
Your test for blow by is gues work at best. Rebuilding a 1HD-T based on that could see you spend $10k solving a problem you don't have.
How many miles has the engine done?
Blow by is not a big issue with these engines. They are known to do 1/2 million km without being touched.
Head gasket failure is also not something they are known for.
I would recommend a couple of things
1.
do some reading in the diesel tech section of the forum.
Particularly about air in fuel lines, stumble, or running rough.
Also search for threads about blow by, catch cans, and oil consumption.
2. Send a used engine oil sample off to Blackstone for analysis. The analysis will tell you if you have coolant in the oil ( head gasket failure). It can also tell you if you have any bearing metal in oil which indicates excessive wear.
OP please do a cold and warm compression test and post results along with numbered spark plug pictures..
Have you ever done a hot compression test of a turbodiesel or pulled spark plugs out of one?
So it a diesel. Ok well, no biggy.
Does it hard start when cold?
When you drive the engine cold does it have blue smoke?
You said white smoke, which can be a leaking injector. Does that happen as soon as it starts or after it’s warmed up?
If it was a boost leak you would have black smoke.
Does the engine coolant look nice and clean or sludgy?
Have you tried a coolant compression gas leak tester? The one with fluid changes changing color?
Have you pressure tested the cooling system?
Does the engine seep fuel in the suction fuel supply lines when engine is off?
When was the last time you changed fuel filters?
Does it hard start when cold?
When you drive the engine cold does it have blue smoke?
You said white smoke, which can be a leaking injector. Does that happen as soon as it starts or after it’s warmed up?
If it was a boost leak you would have black smoke.
Does the engine coolant look nice and clean or sludgy?
Have you tried a coolant compression gas leak tester? The one with fluid changes changing color?
Have you pressure tested the cooling system?
Does the engine seep fuel in the suction fuel supply lines when engine is off?
When was the last time you changed fuel filters?
No. 1HDT's have a boost compensated fuel pump- less boost pressure = corresponding reduction in fuel rate
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Aneroid valve can go bad..
Anyway, seems Ike a leaking injector or bad compression in one or more cylinders
whatever you reckon...
I'm just a 35 year qulified diesel mechanic veteran who's owned several, built a few and worked on many...
but i know sweet FA
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mudgudgeon
Resident galah
Easy way to find out.
Compression test the engine.
White smoke always makes me suspect air is getting sucked into the fuel system.
Time and time again this crops up in the diesel tech section with various questions about smoke, idle lack of power, stumble etc etc.
So often it is simply down to old rubber hoses, primer pump diaphragm failure, or someone has disturbed hose connections, or replaced a fuel filter.
Sure, there's other causes of white smoke, but it's super duper easy to eliminate any of this being the case using clear hose temporarily leading into the fuel pump. Cost next to nothing, and takes 10 minutes, vs spending thousands.
Compression test the engine.
White smoke always makes me suspect air is getting sucked into the fuel system.
Time and time again this crops up in the diesel tech section with various questions about smoke, idle lack of power, stumble etc etc.
So often it is simply down to old rubber hoses, primer pump diaphragm failure, or someone has disturbed hose connections, or replaced a fuel filter.
Sure, there's other causes of white smoke, but it's super duper easy to eliminate any of this being the case using clear hose temporarily leading into the fuel pump. Cost next to nothing, and takes 10 minutes, vs spending thousands.
You started with wise comments. I miss read. Calm down bro. You don’t have to feel insulted. Jeez.
- Thread starter
- #13
White smoke only when warmed up. Have not pressure tested anything yet. No engine oil is seeping and fuel filter was just changed.
- Thread starter
- #14
I appreciate it. I’m really no trained mechanic. I can fix stuff by watching youtube but im dumb when it comes to diagnosing. I appreciate your help and will keep updating this forum as i tackle this problem. Sadly there are no mechanics that will touch this in southern california
Like another member said that a fuel filter sucking air might also cause the problem. Check that too.
Doesn't seem like you have enough experience, Lol.
On a side note about sucking air, I've seen systems that use a pickup tube and screen have issues aerating fuel when the screen is covered in tank debris.
Blowby is also subjective in a sense. I've seen some real bad blowby that dismantles pcv setups because they couldn't clear the gasses fast enough to keep up. I've also seen blowby that didn't seem that bad that choked out engines that couldn't vent the gasses.
It is important though that you follow a testing methodology and don't guess work it. Somewhere online are the PDF Factory service manuals. I would start by downloading those and checking the diagnostics and testing procedures.
Blowby is also subjective in a sense. I've seen some real bad blowby that dismantles pcv setups because they couldn't clear the gasses fast enough to keep up. I've also seen blowby that didn't seem that bad that choked out engines that couldn't vent the gasses.
It is important though that you follow a testing methodology and don't guess work it. Somewhere online are the PDF Factory service manuals. I would start by downloading those and checking the diagnostics and testing procedures.
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mudgudgeon
Resident galah
This is the way to go. There's plenty of knowledgeable people here, and in the diesel tech section, who will respond as you work your way through things
If you don't have a lot of mechanical knowledge, these can be daunting, but they are simple machines, and often only need simple solutions
