a few Nissan SR20DE question

[B_giB]

I know its not Toyota, but as a fair few of you have a wealth of knowledge in other makes I though I would ask here as I cant be bothered signing up to a nissan forum for one question.

I am looking at buying an SR20DE powered Avenir.

I have heard that the oil lines that run above the cam shafts can block up.

I imagine its a fairly easy job, but do I need to replace anything when I do it? O Rings, rocker gasket etc? or can I just use everything if it appears in good shape?

Thanks all

[mega4a]

same thing happened to my mates aviner sr20det it started to knock but once he cleaned those pipes with air gun they were sweet and knock had gone.

maybe just do a new rocker cover gasket while your at it.


mates got it for sale if you wanna but it aviner wagon sr20det

[B_giB]

Cheers for that.

Just after a non turbo daily wagon, cant be bothered with a turbo.

[RomanV]

A mate had one, didnt do an oil change for like 70,000kms ran fine...

So he finally did an oil change, which stirred up the gunk and the next day it blocked up those lines and wrecked the motor.

[mega4a]

yeah aparently its is ment to be a problem with all sr20s rwd and fwd acording to Joe kyle.

easy fix though

[Burning Angel]

yeah aparently its is ment to be a problem with all sr20s rwd and fwd acording to Joe kyle.

easy fix though

Unless you have a vvl sr20(or sr16) motor, the have no oil lines to get blocked.

[B_giB]

yeah aparently its is ment to be a problem with all sr20s rwd and fwd acording to Joe kyle.

easy fix though

Unless you have a vvl sr20(or sr16) motor, the have no oil lines to get blocked.

Are you sure?

[CAMB01]

Those oil tubes lubricate the cam lobes. When the tubes block up the lobes run dry and start wearing down. When it gets bad you either need a cam grind or new cams.

[rollaholic]

in my experience those oil lines blocking are a result of poor servicing habits. the little spray holes are just too small.

newer versions of the SR20 dont seem to suffer from the same issue, though its been a while since i've worked on one.

ultimately cleaning out the holes is usually a temporary fix, once its been left to gunk up to the point those holes start blocking its a big ask to get it all out.

[Lloyd]

Do a google images search for "SR20 cam"
You can see the rail on the right in this pic:
http://www.sr20forum.com/gallery/data/9 ... _S3_07.jpg

They just sit there with a tab onto each cam cap and an oil feed from the gearbox end with a couple of washers (usually).

Old oil tends to be the biggest issue as it starts to gum up with age. Likewise with servicing not being kept up. Some people drill them out slightly to get a little more flow. You'll know fairly quickly once removing the rocker cover if it has been looked after or not.

[Burning Angel]

yeah aparently its is ment to be a problem with all sr20s rwd and fwd acording to Joe kyle.

easy fix though

Unless you have a vvl sr20(or sr16) motor, the have no oil lines to get blocked.

Are you sure?

Sorry I take that back, they do have squirters still.
Its the roller rocker motors that have no squirters.

[92mr2paddy]

sr20de with rocker arms have the oil squirter line, its just a banjo bolt with crush washer so nothing needs replacing apart maybe the rocker cover gaskets if its old, on my old sr20det i drilled them out a 'tiny' bit bigger than what they are factory, im talking 0.5mm, never had problems clogging up but then again if the motor doesnt have any crap built up they wont block,

there was a discussion about engine flush's on here awhile ago, my old daily s14 had a sr20de that looked like it had the factory oil at 200ks, was almost MUD, flushed the whole system and everythings runs fine and no more tapping noises etc, checked under rocker cover after and everythings is super clean, it does work even though some people advise against it. my 2c

[mega4a]

over sizing sounds like a good idea from what ive seen the holes are tiny the banjo hole is tiny as like 0.8mm

[CAMB01]

We used to get in 2 or 3 of these cylinder heads a week for this very problem. They would come in with gunked up oil to the point you had to spend an hour just scrapng it all out before it went in the cleaning tank.
Used to keep spare sets of oil tubes with drilled out holes for this reason.

[B_giB]

What would be the maximum you would drill them out? I imagine you wouldnt want to go to big as you could run into oil pressure issues?

[CAMB01]

2.5mm would be the absolute maximum to make the hole.