Toyota D4d - common fault and how to fix.

[ballibeg]

I'm wary of changing oil spec. Surely manufacturers have done the leg work before stating 5w30?

[TreeswingerPerth]

I'm wary of changing oil spec. Surely manufacturers have done the leg work before stating 5w30?

 

This is the same manufacturers who are not advising people about this injector seal problem unless you get your vehicle dealer serviced .

My truck deffo runs better on the Mobil and the oil stays much cleaner between services .

The 5/30 genuine Toyota oil I used was black after two weeks .

[Johny Walker]

Spent a few hours today in the top end of my D4d engine. Injector seals are a known issue on earlier models so if yours is watch out for this!

 

Initial tell-tale is slow oil pressure rise caused by solids in the pickup screen in the sump; said solids and sludge are from combustion gases leaking directly past the injector seals in the head into the rocker cover where the cams and tappets are - not good; fouls the oil quickly with resultant issue at the bottom.

 

I pullled one injector at a time and had a bit of fun getting the old copper seals out; worked backwards from #4 - all were clean enough, but #1 oh my - see picture - horrendous! Gases had also cooked the o-ring so it was a real mess in there - look at the state of the whole cam box as a result - grim.

 

Copper seal in #1 was very eroded and carbonised; worse still it's as eccentric as it looks in the picture; the hole is well off centre; whether it's eroded that way or was a faulty part from new, who knows but shocking either way.

 

Supposedly sensitive and fragile injectors nonetheless had a wipe down and tip clean; #1 I was a bit more savage with!

 

Clean the injector wells out good (carb cleaner and compressed air), replace with upgraded silver seals and reassemble.

 

Sump off, inspect pump pickup screen, flush and O&F change tommorow...

 

 

do you think running on red has componded the issues

[ballibeg]

So the oils doing its job absorbing carbon rather than it being deposited in the engine?

 

I've heard it argued all ways but agree manufacturers are not quick to admit errors either.

[TimberCutterDartmoor]

I'm wary of changing oil spec. Surely manufacturers have done the leg work before stating 5w30?

 

Nope, it's because of emissions and flow instead of pressure through an arduous oil circuit. Sure don't get thick ol mineral full of polymeric thickeners; get a group 3 or higher basestock synthetic. Loads of modern mutli gas/diesel oils lack the detergency required for a CI engine; just like my FSH toyota has had under dealership advice. :001_rolleyes:

[TimberCutterDartmoor]

The 5/30 genuine Toyota oil I used was black after two weeks .

 

It's utter crap.

 

So the oils doing its job absorbing carbon rather than it being deposited in the engine?

 

I've heard it argued all ways but agree manufacturers are not quick to admit errors either.

 

Not absorbing, but holding in suspension of combustion by-products.

 

Think of an F1 car; Shell Helix packaging - "approved by Ferrari"... or lubed by a small quiet specialist with no interest in marketing hype or OEM approval blah blah blah...

 

My own oil analysis over the past 2 decades has proven afaiac that thinner oils do NOT improve mpg.

Edited April 16, 2015 by TimberCutterDartmoor

[TreeswingerPerth]

Am sticking with my Mobil

[gensetsteve]

Was this a 2008 d4d I ask as this was meant to be the only year that suffered this problem. Interesting write up I have always thought of this as one of the best engines around apart from this little problem.

 

I would hold the Land Rover idea for now 😃

[TimberCutterDartmoor]

Was this a 2008 d4d I ask as this was meant to be the only year that suffered this problem. Interesting write up I have always thought of this as one of the best engines around apart from this little problem.

 

I would hold the Land Rover idea for now

 

2007 in this case but also done the exact same job on an 2002 avensis 2.0 d4d.

 

Once you go to the silver seals, the problem should be solved for good.

[humpo48]

We had a common fault on our D4D engine fitted to a RAV 4. The head gasket went on it. We had to have a new engine fitted.