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Looks like a hairline crack formed by the oil jet. I was able to remove the bolt. I loaded it up with locktite. Took my car and had Evans tuning tune the car a day later. All is working fine. I ordered an oil pressure sending unit to wire into my AEM EMS and have an oil pressure fail safe set up to prevent further damage if it falls out.
Service manual says: no loctite and exactly 16nm. (12ft/lbs)
Overtighting these bolts will damage the jets, and too loose... well, you don't want them to come loose either.
I tackled this project today. The front bolt is a pain to get in. For those looking for the right tools for the job, this is what I put together after fiddling for 1/2 hr. I was able to thread it in, in 30 seconds with this setup. Also, as stated in the thread a telescoping magnetic pickup tool will help you orientate and hold the squirter in place as you tighten the bolt
1/4" driver, extension(s), universal joint with tape to support, and a 10mm socket
I just read through this thread. I'm considering whether to do this upgrade. I would like to find the engine number for my 02 ap1 before I make a final decision. I took a look see at the front of my engine this AM and I see a number stamped in the block on the driver's side under the intake manifold toward the front. The number is obscured by the manifold and impossible to read except for a couple of numbers. Is there a trick to getting a good view of this number? Or is the number recorded somewhere else on the car? This is a US car.
EDIT - I FOUND A WAY TO READ THE NUMBER - NOT EASY.
GOOD NEWS - MY 02 AP1 HAS ENGINE NUMBER 1029198 - LOOKS LIKE I'M IN THE CLEAR. THANK GOODNESS.
All cylinders 1-4 can be scored during sustained high speed operation (do not mistake this for track use) or by FI application, if the jet bolts are not replaced on all four cylinders.
I have to ask, and I have read, and read and debated about the install, can anyone to this day provide concrete proof these oil jet bolts provide better cyl. lubrication than the pre #1025386 engines, in normal conditions.
What is normal?
Daily US driving anywhere.
Occasional autox 7 events a year.
What is abnormal?
Road Race, track driving, extended high Speed driving 100MPH plus for more than 3 minute intervals.
F/I any type.
Does it make a difference and is there any proof?
And I know that guys like Harry Cash and twohoos
would not do it unless they thought there was a mechanical advantage to it. But where are the engine failures resulting in using older jets.
Is the supposed engine failure more viscosity related or is it starvation. Honda stated that the bolt upgrade was not a starvation issue.
Any info?
The proof is Honda changed it for a reason that's all ya need to know lol
Getting a little bit more serious...
In the german Honda S2000 community, one member reported about problems with the new, upgraded bolts. He replaced them on 2 engines, to cure problems with low oil pressure on idle.
He wrote that the bolts should open only above 2 bar / 29 PSI.
He found the pressure regulatuion spring inside the bolts broken on 6 out of 8 bolts, leaving them open all the time, causing the oil pressure problems. Pictures say more than words:
06-03-2016, 02:52 PM
