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post #1 of 8 Old 05-17-2019, 09:49 PM Thread Starter
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445 oil reg spring

I blew a head gasket on my 445. Pulled engine and decided to do a complete overhaul. Engine looked really clean and tight, Lapped valves, honed and new rings, valve seals, normal stuff. Noticed oil pump reg spring did not contact the oil pump plate so the spring had no preload when reassembled. Spring Free length was in spec, but I ordered a new spring and ball. The spring is about 1/16 below the plate which baffles me I had no oil pressure issues before the head gasket blew. I’ve done a lot of bikes and other motors and compressors never saw a reg spring not have preload, same principle on most recip engines and compressors. I called local JD service dept two techs didn’t have a clue on this motor said just put it back in. I’d hate to put this in and have to pull it again. Just can’t see how this can build oil pressure with the relief ball not seated. Thought of shimming the spring enough to seat the relief ball but thought I’d throw it out there if anyone has an answer on this. The front housing where the ball seats looks perfect not wear is evident. Any help appreciated!!
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post #2 of 8 Old 05-17-2019, 11:31 PM
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Re: 445 oil reg spring

I have attached what is in the tech manual for the oil pump. Looks like they base everything on the parts passing specs.
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Russ

Grew up loving tractors and vehicles.
Proud Owner of: 318/420/430
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post #3 of 8 Old 05-18-2019, 09:08 AM
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Re: 445 oil reg spring

First page under second illustration reads...

Important: oil pressure relief valve spring and ball will be loose when pump cover is removed.
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post #4 of 8 Old 05-18-2019, 10:01 PM Thread Starter
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Thanks guys for the responses. I did see that note about the spring and reg ball being loose when you pull the oil pump cover. I took that to mean once the cover was off, basically the parts would drop out or be loose in the sense the cover holds them in place. Maybe I’m wrong, but I’ve worked on so many applications that use this same type of relief system I just can’t accept that the relief could have all that free clearance and develop any kind of oil pressure. As soon as the oil leaves the pump it would relieve pressure and by pass right back to the sump. I’m wondering if possibly this engine for some reason had a shim on top of the spring to pre load it and I just missed it or lost it when I pulled the engine apart. Don’t know, if I have not worked on as many of these things ( not Kawasaki engines but a lot of Harley’s) maybe I’d throw it together as is, but experience tells me it’s not right and I’d be pulling this engine back out as soon as I put it in! I’d love to hear from someone who actually has done overhauls on this particular engine and find out what there experience was. Anyway thanks again, Bob
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post #5 of 8 Old 05-30-2019, 09:31 AM Thread Starter
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Update, after trying to get an answer on that reg spring from everywhere possible I let me wife decide.... shim the spring for preload as I am accustom to seeing, or put together as is. She said put together.... so I did. Installed oil press gauge to monitor, fired it up over 40 psi runs great. That oil pump must put out a lot of volume.... All worried for nothing should have asked my wife first!
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post #6 of 8 Old 05-30-2019, 06:45 PM
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Re: 445 oil reg spring

Quote:
Originally Posted by Refrigbob View Post
Update, after trying to get an answer on that reg spring from everywhere possible I let me wife decide.... shim the spring for preload as I am accustom to seeing, or put together as is. She said put together.... so I did. Installed oil press gauge to monitor, fired it up over 40 psi runs great. That oil pump must put out a lot of volume.... All worried for nothing should have asked my wife first!

Did you tell her that?
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post #7 of 8 Old 05-31-2019, 06:39 AM Thread Starter
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Actually I did...... she is pretty smart even though in this case she didn’t know the difference between the regulator spring or a valve spring! But her intuition amazes me sometimes!
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post #8 of 8 Old 05-31-2019, 08:34 AM
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Re: 445 oil reg spring

Bob Never underestimate a woman's intuition and NEVER EVER tell them they were right. "Thank You, Honey" will suffice...as they WILL Remember they were 'right' for years to come and remind you of it often!!! Bob
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