Following an eventful afternoon in the man cave standing over the parts washer today (having to use the last of my annual leave and I've decided on a self catering holiday in the garage....)..... I decided to strip the oil pump for a clean and inspection.
First thing of note was the amount of 'O' rings present
. Having previously ordered all the required 'o' rings as shown in the parts book I was a bit surprised to discover there are three additional 'o' rings present within the oil pump itself that are not shown in the parts manual, Oh dear
! I toyed with re-using them but like everything on this engine somebody has been inside it before me and they have done what I was planning on doing,turning them around! I cant do that as they are not 'o' in shape any more but very flat where they have been squeezed down, several times it appears.
Does anyone know what size 'O' rings I should order and where I can get them? The parts manual does not list them so I'm a bit stuck, I'm sure my local Honda emporium will not stock them unless I can provide a part number. I can measure the diameter but not the thickness as they really are flat! The 'O' rings I am after are for the gearbox rotor (photo attached) and the main chamber oil seal (the one with the rotor shaft in the photo). Being an oil pump were pressure is everything I don't want to re-fit the old ones and potentially suffering a leak and loss of pressure. I have the other seals all brand new and ready to fit.
On inspection of the pump I checked for wear on the main rotor housing body, it appears to be scored (see photo) although I couldn't detect any discernible 'ridges' in the body with my finger nail although the housing is so small it is difficult to get a finger in there to test it! Has anyone stripped a pump down before and is this type of wear common and is it acceptable? If not is there any way a repair can be undertaken as new pumps are slightly scarce at the moment!
Finally, I mentioned at the beginning of this post that somebody has already been inside this engine, this is confirmend as the main pump rotors (inner and outer) are punch marked and the punch marks should both be on the top face, they weren't the inner rotor punch mark was face down. Looking at the attached photo, is the wear on the rotors acceptable?
Any advice would be welcome as always and despite the setbacks, shocks and horrors I'm actually enjoying the rebuild
.
Regards
Dave