9 out of 10 people that took it apart had issues afterwards, including myself with the last built motor I did. I knwo you said you cleaned it, but.......
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I've had mine apart twice, it's a pretty simple part. No idea if it works yet, will know soon though. I can't imagine any reason why it wouldn't work though, it's just a few pieces and seals/springs if I remember right, like baby apex seals...
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It's apart now I'll see if I can hammer it back together soon. I WANNA DRIVE!
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Thought I'd update and bump the thread.
I picked up a new #1 cam bearing and oil pipe (adapter; the part with the o rings) and installed those with no change. Not that I was really surprised but I started doubting my diagnosis and thinking about just getting enough flow to the rotating assembly to handle some RPM without worrying about the valve timing but also ensuring lubrication makes it to the cam bearing and the actuator. I made 2 block off plates which sandwich under the supply line. The first one had a 1/8" hole drilled into it. This drill size was arrived at by measuring and closely equivalent to the opening in the oil control valve that allows oil to flow past to the moving parts. Sketchy huh? https://lh6.googleusercontent.com/-3...o/DSC_2876.JPG 1/8" made little to no difference in upstream oil pressure! But at least it confirms my suspicion that the loss is down stream. The second plate has a 1/16" hole = 1/4 the area of the first hole. This provides enough oil to the VVT to lubricate while providing 20lb @ 830 rpm and 60lb all the way to 7k rpm with >210* oil!!!!!! Although this does not provide enough oil for the VVT to function at any level it does 1. Prove the loss is the the VVT system. 2. Provide flow/pressure enough to keep the reciprocating parts happy. THIS IS A TEMPORARY EXERCISE Any thoughts? What would you do next? |
1. It proves there is not enough oil volume coming from the pump to feed everything that currently needs to be fed. It does not necessarily villainize the vvt mechanism. The vvt mechanism does require a fair amount of oil, hence the size of the pipe compared to, let's say, a turbo oil feed line. The vvt may still be bad but I wouldn't consider this to be a conclusive deduction.
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Originally Posted by patsmx5
(Post 1221688)
I've had mine apart twice, it's a pretty simple part. No idea if it works yet, will know soon though. I can't imagine any reason why it wouldn't work though, it's just a few pieces and seals/springs if I remember right, like baby apex seals...
Regarding your engine, I'd still try a 50W oil next. It will not flow as easily, thus whatever(s) in your engine that is leaking too much oil will leak LESS and this will result in higher oil pressure. Worth a shot. Otherwise you gotta tear it down and find out where the leak is. |
Originally Posted by stigish
(Post 1224717)
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Although this does not provide enough oil for the VVT to function at any level it does 1. Prove the loss is the the VVT system. Sixshooter said it well. What you need to understand is that the pump does NOT supply pressure. All it does is supply FLOW. It pumps a certain amount of oil. All the restrictions in the system (bearings, oil squirters, VVT thingy, etc) present a RESTRICTION to the flow, and thus the pressure rises because of this restriction. You have a big leak(s) somewhere causing a lot of oil to go to one place and not much going everywhere else, and this also means lower oil pressure. You can do the same thing with a turbo car. Unhook the blow off valve from the charge pipe and watch all the boost go right out the hole instead of in the engine. No restriction, no pressure. |
Ok, granted guys. Using process of elimination, the squirters are installed with the copper washers and locating pins located and torqued to spec. The bottom end has a max clearance of .00225. The head has no cam bearings. So the head is left.
I guess clearancing all the saddles may point to a new head. Anyone know BP6D clearance? My search showed .006 max for 99 and before. |
Originally Posted by stigish
(Post 1225402)
Ok, granted guys. Using process of elimination, the squirters are installed with the copper washers and locating pins located and torqued to spec. The bottom end has a max clearance of .00225. The head has no cam bearings. So the head is left.
I guess clearancing all the saddles may point to a new head. Anyone know BP6D clearance? My search showed .006 max for 99 and before. --Ian |
Also I believe the oil pump has an O-ring at the discharge of the pump IIRC. If that O-ring is missing, bye bye oil pressure? Maybe this is your problem.
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1 Attachment(s)
Originally Posted by patsmx5
(Post 1225496)
Also I believe the oil pump has an O-ring at the discharge of the pump IIRC. If that O-ring is missing, bye bye oil pressure? Maybe this is your problem.
Originally Posted by stigish
(Post 1219258)
I bought the BP6D-14-100 from Rosenthal and it did not come with an Oring (Cheap Bastards) but I had one i used with fresh RTV gasket.
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I have only just considered blocking the squirters.
No massive puddles of oil on the floor to account for this much loss. |
Originally Posted by stigish
(Post 1225518)
I have only just considered blocking the squirters.
So do tens of thousands of others. So did yours, before whatever went wrong went wrong.
Originally Posted by stigish
(Post 1225518)
No massive puddles of oil on the floor to account for this much loss.
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Yeah I know, new head or squirters? Or I haven't found the problem yet.
The pump outlet aligns with the block galley and seals with the o ring and/or RTV. If no seal then big leak. |
Did the machine shop remove the oil restrictor from the block when cleaning it and not reinstall it?
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Originally Posted by stigish
(Post 1225536)
Yeah I know, new head or squirters? Or I haven't found the problem yet.
The pump outlet aligns with the block galley and seals with the o ring and/or RTV. If no seal then big leak. Try this: Put in 50W motor oil. If pressure goes UP, you have a leak after the pump. If pressure goes DOWN, you have a restriction before the pump (leaking/cracked/clogged pickup tube for example). Try something man! That or tear it down and start going through it. |
Originally Posted by sixshooter
(Post 1225543)
Did the machine shop remove the oil restrictor from the block when cleaning it and not reinstall it?
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1 Attachment(s)
Originally Posted by patsmx5
(Post 1225546)
Curious what is this? I've never heard of it.
That plug goes in the galley which feeds oil up from the block into the head. It's present in every Miata engine from 1990 through 2005, be it HLA, solid or VVT. |
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