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12-30-2021, 05:37 PM | #11 |
Not Yet Wild
Join Date: Dec 2021
Posts: 15
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Re: Robins 295 won't start after rebuild
03D4D06B-4882-4D8F-AF00-22468F1D363F.jpg
2E23A1F7-643F-4A2F-B153-25C842EE5642.jpg Here are the before and after of the timing. I added oil to the cylinders and the max was still 90. I held the throttle wide open by hand. I checked the valves again and .004 will slip in and .008 will not. I didn't want to but I am going to pull it back out of my cart and start tearing it down to figure out what is going on. I sent it off to have it rebuilt because I didn't have the time to mess with it....LOL It took them 6 months to rebuild it because they had so many engines to do. I am just going to eat it and fix it myself. Thank you everyone for your help. I will update as I find something wrong. |
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12-30-2021, 08:17 PM | #12 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,217
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Re: Robins 295 won't start after rebuild
Quote:
Let us know what you find ? Thanks for the update. |
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12-30-2021, 08:32 PM | #13 |
Not Yet Wild
Join Date: Dec 2021
Posts: 15
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Re: Robins 295 won't start after rebuild
26C06BBC-A971-4712-AC42-8F2932C5C82D.jpg
7C11B53D-52A2-4D09-AC47-F4371CECFDF4.jpg 6DF2E36B-A3F8-439E-AB4B-0724B6A3E4AD.jpg CBDF36F2-4CFE-449C-A5DE-709D1BBD90B7.jpg AFBDAA8F-58CB-4952-A76C-1ED29227D129.jpg Here are some of the pics of the valves. The seat on one of the intake valves does not look good at all and the other is questionable. Seems like a LOT of soot in the exhaust ports, not sure about this. I can’t see anything that looks like a bent valve. The springs seem very week as I could remove them by hand with no tools. Is this normal? The pistons are new and the piston walls seem good. Everything is tight there. The only thing could be the rings aligned but I don’t really want to pull them out just yet. Looking for thoughts, opinions and direction!! |
12-30-2021, 09:36 PM | #14 | |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,217
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Re: Robins 295 won't start after rebuild
Quote:
It looks like they never seated the valves. You got any valve grinding compound ? where you can lap them in and see if you get that tiny center ring in center ? These are also the old style valves. Newer style much better. These springs most always weak and easy to key. I use my fingers to key them up. I am not sure about yours. That one intake seat on right side of picture looks sort of bad like it needs grinding with a rock. Lapping might not work. This may be your compression issue. Hard to believe someone actually rebuilt this head. |
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12-30-2021, 09:52 PM | #15 |
Not Yet Wild
Join Date: Dec 2021
Posts: 15
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Re: Robins 295 won't start after rebuild
Yes, the one intake valve seat seems to be a big issue and I think the other intake valve seat may not be perfect either. I will lap all of them once I get some lapping compound. Its hard to tell anything about the rocker arms. looks like they have had an issue and were cleaned up. If someone grinds them too much can that be an issue? I was hoping for more of a clear cut problem!! I have it this far, should I go ahead and pull the pistons and check the rings?
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12-30-2021, 09:57 PM | #16 |
Not Yet Wild
Join Date: Dec 2021
Posts: 15
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Re: Robins 295 won't start after rebuild
34ABFFBC-81AE-4198-BFAB-261F7D3B6C72.jpg
99AE0885-1C5B-4B59-84DD-5024767366D1.jpg 95AA89E5-D824-4A7B-AACA-9481BED23F8D.jpg 12C3DE37-8DC5-470C-B1E8-8CCC413C985A.jpg D0C05965-DEE5-4408-B226-DB8C6CED5047.jpg More pics of head, pistons and cylinders. |
12-30-2021, 10:07 PM | #17 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,690
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Re: Robins 295 won't start after rebuild
Agree those valve seats look like sh———
Get some lapping compound and try and lap them in. I almost never use the course compound, just the fine but you may need the course for this job. Looks like paint or dirt under the paint in the seats from them painting it. Rebuilders frequently like to paint everything…. Maybe use a bit of Emory cloth and try to clean it up a little bit before lapping them. |
12-30-2021, 10:07 PM | #18 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,690
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Re: Robins 295 won't start after rebuild
And I wouldn’t worry much about the cylinders or rings. If that was the problem then oil would have raised compression. I’d say your compression loss is definitely in the top end
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12-31-2021, 12:00 AM | #19 |
Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,217
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Re: Robins 295 won't start after rebuild
If it were me I would make a phone call first thing Monday morning to
Precision Engineering in Saint Louis. If nothing else see how they respond so others here can see. Send them pictures of what you found before you go any further. It won't hurt plus you probably need a head gasket and nobody will be open until next week. If you don't want to deal with them I understand. 2020 and 2021 has been a very difficult for those who work on these carts, especially engines. Parts are hard to find, everyone is months behind. It could have been they hired someone to help catch them up that was not qualified. Lets all hope 2022 will be better. Happy New Year and good luck with what ever you decide. |
12-31-2021, 01:53 AM | #20 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,690
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Re: Robins 295 won't start after rebuild
Shoulda sent it to trig for a proper build. I hear he’s old and got all the time in the world for that
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