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  #1   IP: 174.89.8.43
Old 10-18-2020, 07:03 PM
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Impromptu Overhaul

After a busy start to the fall with some home renovations, it's time to get the engine stripped down and to the block shop for testing and measuring. This is the engjne fhat came with the boat and had a cracked oil pan. The used one in the boat currently I improperly winterized and it cracked just above the water jacket access plate. I'll be using the oil pan from that one on this rebuild.

The Moyer manual has been very helpful and I am learning a lot about engine parts!

Of course the first bolt to shear off is the hardest to take. One of the accessory drive bolts. Had two more shear on the water jacket cover. Planning on putting studs in for the rebuild.

How does one access the crank journal nuts under the oil filter? I can't fit a socket for a breaker bar in there and the spanner isn't long enough.

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  #2   IP: 32.211.28.40
Old 10-18-2020, 09:36 PM
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That oil screen (not really a filter, it only keeps out the lumps) is on 1/8" NPT fittings. Unscrew it and take it off.
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  #3   IP: 192.186.122.174
Old 10-19-2020, 08:52 AM
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Quote:
Originally Posted by Al Schober View Post
That oil screen (not really a filter, it only keeps out the lumps) is on 1/8" NPT fittings. Unscrew it and take it off.
The screen portion itself unscrews?
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Old 10-19-2020, 03:26 PM
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Greg,

Here is a page from the A4 parts catalog showing the oil screen and how it is attached. Avoid the mistake I made of reaching for a 'bigger hammer' for this job. I broke the street elbow where it meets the main bearing cap.

jack.
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Old 10-19-2020, 04:19 PM
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Quote:
Originally Posted by jcwright View Post
Greg,

Here is a page from the A4 parts catalog showing the oil screen and how it is attached. Avoid the mistake I made of reaching for a 'bigger hammer' for this job. I broke the street elbow where it meets the main bearing cap.

jack.
thanks for the heads up ( as I gently lay the hammer back down...)! Was your intention to have it unscrew at part #17 on the diagram?

Do you know why there is a spring?
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Old 10-19-2020, 04:47 PM
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The screen itself is like a sock over an internal frame. The pipe threads are in the internal frame. The spring (I think there's a washer too) holds the sock against the frame and sorta makes a seal.
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Old 10-19-2020, 05:03 PM
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I was flying blind when I removed the oil screen assembly. I didn't have the Moyer manual or the parts catalog at that point. Mainly I was determined to reduce the weight of the engine so I could get it out of the boat, and I wanted to get at the crankshaft.

I've attached a photo of parts #17 & #18 in the earlier diagram. I *think* I was trying to rotate/unscrew the oil screen & frame assembly where it is attached to the nipple. In the process I applied too much force on the street elbow and sheared it off where it meets the main bearing cap (see top left of the photo).

IIRC, the spring you ask about presses the oil screen against the frame (#14).

Hope this helps.

Jack.
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