LN167R Blow-by issues

pennyp

New Member
Hi all,

I've recently discovered my '98 3.0L Hilux has bad blow-by. There has also been an increase in oil and fuel consumption, and I've noticed reduced power, especially with hills. I've had the vehicle for over a year and it was running consistently until recently. It's possible the blow-by was there when I purchased it however I didn't notice nor has anyone else who has looked at the vehicle. And like I said, it was running very consistently until the last month or so.

I want to run through any precautions before I assume that the piston rings need to be changed and cylinder walls honed. I'm thinking of running FTC decarbonizer and oil flushing concentrate from Cost Effective Maintenance. Has anyone used this for blow-by and what results did you get? Also, is this bad to use on the old engine?

I'd like to clean the crankcase ventilation as well but I'm not sure where to locate this. I've attached some photos - apologies if that doesn't show the right angle. I'm also not sure where the PCV valve is if it has one?

Any other suggestions would be greatly appreciated. Thanks all
 

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Toyasaurus

Well-Known Member
I have used cem for years, but only the injector cleaner and friction modifier.

Try the decarbonize, oil flush and injector cleaner.
A new set of filters and the friction modifier, good quality oil should help.
Sorry I can`t help with the PCV or CC breather, I`m sure someone will let you know.

Give that a try.
 

pennyp

New Member
I have used cem for years, but only the injector cleaner and friction modifier.

Try the decarbonize, oil flush and injector cleaner.
A new set of filters and the friction modifier, good quality oil should help.
Sorry I can`t help with the PCV or CC breather, I`m sure someone will let you know.

Give that a try.
Thanks mate, I'm pretty keen to try the CEM products as a last resort.
 

CTL

Well-Known Member
I presume you mean the tappet cover cap not the fuel cap. And yes, any diesel will spit oil and fumes if you take that cap off, nothing unusual.
 

pennyp

New Member
I presume you mean the tappet cover cap not the fuel cap. And yes, any diesel will spit oil and fumes if you take that cap off, nothing unusual.
Whoops, wrote that with tired eyes. Yes the tappet cover cap. What's a normal amount of air coming out from that? Currently I can't rest the cap on as the pressure is too much
 

Batts88

Well-Known Member
I used CEM engine flush yrs ago on a Patrol it claened a lot of gunk out of the engine but I wouldn't say it reduced blow by but I wasn't concerned about it that much. I fitted a catch can I also used the engine oil additive which made the old engine a little bit quieter and put some in tbe gearbox which made it a bit smoother. I don't know a great deal about what is considered excessive blow by a mechanic would know. You should probably be getting it checked to find out roughly how much power you may have lossed and the engine oil consumption. It also depends how many k's your engine has done.
 
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Klu574

New Member
Before you think about changing piston rings, giving the FTC decarbonizer and oil flush a shot is a good idea. It really helped me out. Just make sure you do exactly what the instructions say. These things usually work fine on older engines, but you gotta be careful.
 
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