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Tractor Talk Discussion Forum

Perkins AD3-152 head cracked - saga?

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Author  [Modern View]

09-12-2017 15:08:34

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I recently overhauled a 3 cylinder perkins in a Massey Ferguson badged Landini for a neighbor. It had about 7500hrs and the oil pump gears came apart and split the pump and it spun the #3 rod bearing. I tore it down and had a reputable machine shop do the head, check/repair the rods, replace the liners, repair the crank. I reassembled (parts supplied by the machine shop) and my neighbor put it back in the tractor. I went over and assisted with the first start and retorqued the head after it had warmed up.

After he'd run it for about 10 hours I had a call that it was low on power and smoking. It broke the rocker arm on the #1 intake valve. I found the machine shop had installed the new guides 0.100" too high in the head and the valve caps were contacting them (also 2 were in upside down). I removed the head and they did it again. I reinstalled the head and we started it up, did a retorque but we had a fuel leak and some other issues so we didn't run it long. A few days later he fixed the other issues and it is apparently now leaking coolant from one of the studs that holds the #1 injector. Has anyone run into one of these heads cracking into the injector stud hole before or have a reason why? Thanks, Sam

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JD Seller

09-12-2017 17:48:50

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 Re: Perkins AD3-152 head cracked - saga? in reply to tractorsam, 09-12-2017 15:08:34  
I do not think it is cracked. IRC some of those studs go into the water jacket. You have to use sealant on them when you install them.

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09-12-2017 18:39:14

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 Re: Perkins AD3-152 head cracked - saga? in reply to JD Seller, 09-12-2017 17:48:50  
Thinking back - I had the studs out when I sent the head in the first time and I can't remember if I put anything on them when I installed them the first time. I think I may have used never seize. I took them back out before sending the head back in and I know I didn't put anything back on them this time. Sam

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09-12-2017 18:00:47

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 Re: Perkins AD3-152 head cracked - saga? in reply to JD Seller, 09-12-2017 17:48:50  
Fingers crossed, sealant I can do. Thanks, Sam

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