Prelude BB1 H22 Oil Pressure Switch Replace

uberNoobZA · Post by **uberNoobZA** » Sat Dec 30, 2017 4:07 pm

I suspect that my oil pressure switch is leaking oil (which is dripping onto the exhaust), so I've got a replacement (it's a known issue allegedly). I was wondering if anyone knows whether or not I need to drain the oil first ? After all, the oil pressure switch is located under the oil filter on the engine, so surely if I remove it, oil will leak out? Or am I not understanding how the oil pressure switch works ?

I watched a video of someone replacing one of these switches on Youtube, but he didn't say anything about draining the oil first.

Post by **Drax** » Sat Dec 30, 2017 7:30 pm

uberNoobZA wrote:I suspect that my oil pressure switch is leaking oil (which is dripping onto the exhaust), so I've got a replacement (it's a known issue allegedly). I was wondering if anyone knows whether or not I need to drain the oil first ? After all, the oil pressure switch is located under the oil filter on the engine, so surely if I remove it, oil will leak out? Or am I not understanding how the oil pressure switch works ?

I watched a video of someone replacing one of these switches on Youtube, but he didn't say anything about draining the oil first.

I'd say as long as your quick about the changeover once the current one is loose, you'll be ok

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sat Dec 30, 2017 7:49 pm

You will get a minor oil leak but it's above the sump so it's literally just a little bit that's left in the gallery.
No need at all to dump the oil first.

uberNoobZA · Post by **uberNoobZA** » Sat Dec 30, 2017 7:56 pm

Thanks

Post by **Vtecmec** » Sat Dec 30, 2017 8:29 pm

As above, I've done it before. Also check the oil filter area above it for leaks, it's more common and could actually be the issue.......

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sat Dec 30, 2017 8:35 pm

Yep, that's a good point, had forgotten

Very likely to be the oil cooler seal that has gone, rather than the oil pressure switch.
It's a job that's been fairly well covered on the forum, probably in the wiki. If not, then I know I did a write up in the profile for Lisa's lude (link in my signature to that profile).

uberNoobZA · Post by **uberNoobZA** » Sat Dec 30, 2017 9:39 pm

When I replaced the oil filter and flushed the oil, i gave it a bit of a clean underneath, and it seems the leak is from the oil pressure sensor and likely also the vtec solenoid gasket. Got a new oil pressure switch and got the gasket on order. Already done the head gasket, which was also perished.

Post by **vanzep** » Sun Dec 31, 2017 11:38 am

here is the part number for the oil cooler o ring
Oil cooler seal - Honda pt no.91316-pe7-730 62.4X3.1
Htune or Honda - should be under a tenner for the part

uberNoobZA · Post by **uberNoobZA** » Sun Dec 31, 2017 6:18 pm

replaced the oil pressure switch and gave a bit of a clean around the oil filter and switch.

A little bit of oil did come out when I removed the existing switch, but that's probably because I had the car jacked up at the front quite high, with the rear still on the ground. If it had been level, then I doubt any would have come out.

Simple enough job. Thanks y'all. Will keep an eye on the oil leak and if it persists, then the o ring will be the next bit to replace (as well as the vtec solenoid gasket which is on order from H-Tune)

uberNoobZA · Post by **uberNoobZA** » Wed Feb 07, 2018 8:23 am

So it's not the oil pressure switch that's leaking oil. The oil is dripping onto the switch from above, but this is only visible if you leave engine running and then look under car (hence I never noticed it before, but only saw oil on the oil pressure switch).

It drips onto the switch from the base of where the oil filter screws in, as shown in the red areas in the pictures below. Not sure where the oil actually comes out though. Advice would be appreciated.

This pictures shows the base of the oil filter seems clear of oil, with the oil actually only seen in the section marked in red.

To my untrained eye, it SEEMS like the oil might be coming from the base of whatever the item labelled as 19 is in the diagram below (item 31 is the oil filter O-ring, which I assume sits between oil filter and whatever item 19 is - there doesn't seem to be oil around the O-ring, so I don;t think it's that)