1PZ engine flush (1 Viewer)

[Abde]

Land Cruiser 77 series, 1991 model
Engine age 34 years
Distance traveled: 198K
The engine was rebuilt in 2012 or 2013.

I am now thinking of flushing the engine from harmful oil deposits, as well as the channels and tank, with special products from the German Liqui Moly.

Now the question that attracts my curiosity is whether these products are harmless to the engine because it is old or worn out, and will their results not be adverse and lead to engine damage?

What is the best and safest way to flush an old or worn out engine, and what is the alternative method?
What products are suitable for engine condition?

This is a case of cooling water (household water) not coolant or distilled water.

 

[JuanJ]

Hello,

Chances are there is no information on whether oil changes were done at specified intervals.

It is possible that there are gum/sludge deposits. It is worth removing the valve cap and the oil sump and taking a look.

Some fluids have cleaning properties that are specific for heavy deposits. Check your deposits, and their condition, before buying a product. I understand LiquiMoly has enough variety. Choose carefully, and watch before you buy.

Flush fluids, if used according to the instructions supplied by the manufacturer, are not a risk for an engine, regardless of its age.

A higher viscosity oil will suit your engine.

The photos suggest that there is a lot of corrosion due to the use of tap water. A flush can cause corroded parts to break, and the radiator to leak like a sieve.

A while ago, a 'Mud member did a cooling system flush with a commercial product, only to see the cooling system fall apart. For more details, the Search function is your friend.

It is possible to do a less aggressive flush. In a nutshell:

1. Drain the coolant.
2. Take the chance to have the radiator re-cored and repaired. Replace it if you can.
3. Wash the coolant bottle/tank with water, detergent and a brush.
4. Fill the cooling system with proper coolant, and then drive, say, 100 or 200 km.
5. Replace the coolant.

You should replace the water pump as well. Keep an eye on the cooling system piping, and replace parts as leaks appear.

Last but not least, some parts from the 1HZ engine fit the 1PZ.





Juan

 

[Abde]

Hello,

Chances are there is no information on whether oil changes were done at specified intervals.

It is possible that there are gum/sludge deposits. It is worth removing the valve cap and the oil sump and taking a look.

Some fluids have cleaning properties that are specific for heavy deposits. Check your deposits, and their condition, before buying a product. I understand LiquiMoly has enough variety. Choose carefully, and watch before you buy.

Flush fluids, if used according to the instructions supplied by the manufacturer, are not a risk for an engine, regardless of its age.

A higher viscosity oil will suit your engine.

The photos suggest that there is a lot of corrosion due to the use of tap water. A flush can cause corroded parts to break, and the radiator to leak like a sieve.

A while ago, a 'Mud member did a cooling system flush with a commercial product, only to see the cooling system fall apart. For more details, the Search function is your friend.

It is possible to do a less aggressive flush. In a nutshell:

1. Drain the coolant.
2. Take the chance to have the radiator re-cored and repaired. Replace it if you can.
3. Wash the coolant bottle/tank with water, detergent and a brush.
4. Fill the cooling system with proper coolant, and then drive, say, 100 or 200 km.
5. Replace the coolant.

You should replace the water pump as well. Keep an eye on the cooling system piping, and replace parts as leaks appear.

Last but not least, some parts from the 1HZ engine fit the 1PZ.





Juan

Hi Juan,

Oil change every 3000 km and not at specific intervals I will check the condition of the oil by removing the oil pan in order to buy the right product carefully, I will stick to oil from Liqui Moly which is more suitable for the Middle East 10W40 or 10W50.

Yes there was a big leak from the engine block and it was fixed and a leak from the heating pipes and dirt reached the front and rear heater sub units and a big leak from the radiator and the radiator was replaced and there is no leak so far I did the less powerful cleaning by changing the coolant three times and the dirt is still the same with distilled water .
When the cleaning process is complete I will replace the water pump.

Thank you Juan

 

[TheBussman]

I wouldn't flush the oil system unless there was a good reason too. Like if you took the valve cover off and you saw sludge building up. even then you are taking a risk using a flush product. sometimes a large chunk of sludge will fall down into the oil pickup and starve the engine of oil. One of the reasons why pretty much every car and engine manufacturer does not recommend flushes. I would just keep doing what your already doing and change the oil regularly.

 

[JuanJ]

Hi Juan,

Oil change every 3000 km and not at specific intervals I will check the condition of the oil by removing the oil pan in order to buy the right product carefully, I will stick to oil from Liqui Moly which is more suitable for the Middle East 10W40 or 10W50.

Yes there was a big leak from the engine block and it was fixed and a leak from the heating pipes and dirt reached the front and rear heater sub units and a big leak from the radiator and the radiator was replaced and there is no leak so far I did the less powerful cleaning by changing the coolant three times and the dirt is still the same with distilled water .
When the cleaning process is complete I will replace the water pump.

Thank you Juan

Hello,

You can change oil every 5000 km. 3000 km changes are a little bit overkill. A slightly more viscous oil suits an old engine well.

Good products are available from LiquiMoly. Some engines run a tad quieter with their engine oil. It may be difficult to ascertain in a diesel, though.

You may need to perform one or two more flushes. Patience. Note that sometimes the dirt builds up in the coolant tank/bottle. You can filter the dirty coolant, wash the bottle, refill and repeat until the coolant in the bottle is clean. It is not exactly by the book but it helps.

You can take the chance to change transmission, transfer and differential oils.





Juan