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11-06-2020, 04:18 PM | #21 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,509
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Re: Replacing a loose valve seat
Quote:
Thank you for the complement. It sux when $$ get in the way of our 'toys'. |
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11-06-2020, 05:03 PM | #22 | |
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Join Date: Dec 2019
Posts: 1,196
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Re: Replacing a loose valve seat
Quote:
Years ago they were hacked due to the value of the car. The cost of pulling the engine and having a valve seat correctly installed is minimal provided you do the labor.a few gaskets a valve seat and machinist time is all you are out of pocket,given the block damage its under 300 bucks..whats your engine worth ? How about your car? When you could buy one for 10 bucks they got hacked...only a fool hacks a 15k car |
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11-06-2020, 05:09 PM | #23 |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,353
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Re: Replacing a loose valve seat
You're making some interesting assumptions about my prior investments in hoists, jacks, crates to put the engine in, a truck to haul it around... oh wait, I forgot, the magical "guy from the local club" is supposed to provide these for me.
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11-06-2020, 08:41 PM | #24 |
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Join Date: Dec 2019
Posts: 1,196
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Re: Replacing a loose valve seat
Model A club 'goodwill'? meh..the good lord helps those who help themselves,once they found out I've been a mechanic for 40 years they were on me like flies on shit..you're tooled up? quit posting and get to work,it always goes faster than you dread..the satisfaction from a quality repair performed at minimum cost far outweighs the risk..
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11-06-2020, 11:05 PM | #25 | |
Senior Member
Join Date: Jun 2010
Location: 34.22 N 118.36 W
Posts: 1,055
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Re: Replacing a loose valve seat
Quote:
J
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As Carroll Smith wrote; All Failures are Human in Origin. |
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11-10-2020, 11:25 PM | #26 |
Junior Member
Join Date: Mar 2019
Location: Niagara Region, Ontario
Posts: 14
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Re: Replacing a loose valve seat
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All the best in your repair, op. -Theo Sent from my SM-G973W using Tapatalk
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Around The Block Engine Machining and Precision Babbitt Bearings Previously known as Precision Babbitt Service Building Engines from 1900-1955-ish in Ontario, Canada Web: www.aroundtheblockengines.ca Instagram: @aroundtheblockengines |
11-11-2020, 12:46 PM | #27 |
Senior Member
Join Date: May 2010
Location: Santee, California
Posts: 3,505
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Re: Replacing a loose valve seat
From Brent....
As far as the India-made cutter, there is a portable valve seat machine manufactured by Neway that will dress valve seats. The two or three issues I have personally seen with these is they are not really robust enough to cut the new angle on a new seat that is vertical in shape where the 45° angle usually is. The next issue is these hand-operated cutters are very easy to apply pressure on the pilot in a direction that pushes the cutter outside of perfect alignment with the guide bore. When this happens, the concentricity of the seat is not in alignment with valve face. The third thing is many times you will see start & stopping places from the carbide cutters when being twisted by hand that left tiny gouges in the seat. Generally speaking, compression pressure leaks across the seat and this can cause poor performance or even cause a burned valve. I can vouch for the accuracy of all the above. The human element of controlling the allignment during the process is very difficult to achieve. I have done three jobs with the Neway device, it is very difficult to get excellent results. |
11-11-2020, 12:48 PM | #28 |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,353
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Re: Replacing a loose valve seat
I'm hoping to get it done next week; I'll be sure to report back on how it goes and what tools were used.
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11-19-2020, 03:22 PM | #29 |
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Join Date: Apr 2018
Location: Mebane NC
Posts: 2,353
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Re: Replacing a loose valve seat
OK, I just had the new seat inserted and ground in, plus he reground the other 7 seats. Unfortunately I had to take a call and I missed the actual doing of the thing, so I don't know what he used except that he said he uses stones rather than carbide cutters.
However, he did recommend a product called Seal-Lock Fluid Weld for anyone doing valve seat inserts, valve guides, and minor crack repair. I had brought some with me to ask about, and it turned out he had his own supply and used it all the time. You spread it underneath the insert, and between the guide and the bore. When the engine is run, the polymer flows into any gaps between the steel parts and the block, and then the heat sets it permanently. This helps keep the parts in place and improves heat transfer. Formula is proprietary but is suspected to use hexagonal boron nitride as the "active ingredient." Next step is to put some Prussian blue on my new valves from Snyder's and see how accurate the grind is. |
11-19-2020, 03:56 PM | #30 |
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Join Date: May 2010
Location: Southern Maine
Posts: 1,498
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Re: Replacing a loose valve seat
If the guide was treated with the magic juice I hope your new valves are straight stems. This is a fascinating discussion, I'm old enough to remember the local automotive machinist coming to the shop with his hand held tools and doing a flathead valve seat replacement neat and clean. Small upcharge for the house call.
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11-19-2020, 04:00 PM | #31 | |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,353
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Re: Replacing a loose valve seat
Quote:
Guy did the whole repair on the driveway in front of the shop. New insert, ground all the seats, charged $60. I said I had $56 in cash, he said that'd be fine. |
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11-19-2020, 04:22 PM | #32 |
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Join Date: May 2010
Location: Southern Maine
Posts: 1,498
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Re: Replacing a loose valve seat
Bet you are excited now! Good to hear a happy ending.
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11-20-2020, 01:12 PM | #33 |
Senior Member
Join Date: May 2010
Posts: 364
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Re: Replacing a loose valve seat
Hello
I had this problem on the number number 4 cylinder . I went to the auto parts store with the old seat and got the next size up then i took a piece of strut material and drilled two holes to match the head bolts next to the seat and used a socket just a little smaller than the seat and used the head nuts to press it into the block ,worked good . you do have to grind the new seat after and hand lap the valve. Dennis |
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