mat in tn Posted April 14, 2023 Share Posted April 14, 2023 Yes, I'm also very exited about summits answer... As I'm using all stocks (springs, rockers, etc.) and have tighten the rockers ad specified, I also can't imagine that one of these parts are guilty...I also have turned the engine by hand many times at the stand as checking the valve clearance... I also have used a special break-in oil and done a change after the break-in...so in my opinion I have done, what's possible... I'm looking forward to a good solution for this. I love these broncos and will have one when the right one shows up. I know you have been on a real journey with this one. it's time to enjoy it. Link to comment Share on other sites More sharing options...
ReneH Posted April 15, 2023 Author Share Posted April 15, 2023 I'm looking forward to a good solution for this. I love these broncos and will have one when the right one shows up. I know you have been on a real journey with this one. it's time to enjoy it. Thanks! Yes, it was and still is a journey. I will disassemble everything necessary and get the cam out tomorrow. While waiting for an answer and, hopefully, a new cam without additional costs, o woll work on my tailgate window, my keyless entry and also install the 7" android radio with 360° cams... Link to comment Share on other sites More sharing options...
ReneH Posted April 16, 2023 Author Share Posted April 16, 2023 I think going back to Summit is a good idea. Surely they've had others with similar problems. And if the lifters rotate in the bores then that' not the problem. Must have been the cam. So, today I have removed the cam...what shouls I say...it doesn't looks better outside as already seen on the pics of the stethoscope cam... I'll go up to summit also with these pics....I hope they will replace the cam FAST... We will see, what they are answering... Link to comment Share on other sites More sharing options...
mat in tn Posted April 16, 2023 Share Posted April 16, 2023 So, today I have removed the cam...what shouls I say...it doesn't looks better outside as already seen on the pics of the stethoscope cam... I'll go up to summit also with these pics....I hope they will replace the cam FAST... We will see, what they are answering... I know you did not want to get back into the engine, but you will be glad that you did. that lobe is badly damaged. is it just the one lobe, or are others worn also? now is the time to study everything. triple check every step. Link to comment Share on other sites More sharing options...
ReneH Posted April 16, 2023 Author Share Posted April 16, 2023 I know you did not want to get back into the engine, but you will be glad that you did. that lobe is badly damaged. is it just the one lobe, or are others worn also? now is the time to study everything. triple check every step. No, the others seems to be OK. Maybe one lifter has another pattern...but also a circle. No lines on it. So this is identical to the lobes. Nothing you can see without measuring... I have to hone the bore of the defective lifter. It got scratches from removing the lifter... I have inspected also the inlets of the bores. No ridges...only at the one with the defective lifter. Also the cam bearings are ok. Nothing suspicious.... I have also tried to punch the defective lifter and a good one...without any difference.. Link to comment Share on other sites More sharing options...
Gary Lewis Posted April 16, 2023 Share Posted April 16, 2023 No, the others seems to be OK. Maybe one lifter has another pattern...but also a circle. No lines on it. So this is identical to the lobes. Nothing you can see without measuring... I have to hone the bore of the defective lifter. It got scratches from removing the lifter... I have inspected also the inlets of the bores. No ridges...only at the one with the defective lifter. Also the cam bearings are ok. Nothing suspicious.... I have also tried to punch the defective lifter and a good one...without any difference.. I'm glad you pulled the cam. That lobe is truly bad, and some of the others may be suspect. Hopefully Summit will come through for you. Fast. Link to comment Share on other sites More sharing options...
ReneH Posted April 16, 2023 Author Share Posted April 16, 2023 I'm glad you pulled the cam. That lobe is truly bad, and some of the others may be suspect. Hopefully Summit will come through for you. Fast. Yes, I also hope they'll will send me a new cam...but my experience with other companies have shown me the opposite. In parallel inwill claim the lifters at rockauto.com...I have made the experience that they are very close to the customer and send credit notes also for small damages. Don't pulling the cam was not an option. I want to drive this car a long time, so I want to be sure that all basics are in very good condition. As I have choose the bronco as our family truck, I've searched for one with a destroyed engine, cause we have a company, located in the Netherlands, that supplies very good and payable fully overhauled engines directly done in the USA. Including a three year guarantee. But the 80th bronco are rare in Germany...so I haven't found one in good condition with a destroyed engine...I've found the one I've bought, that looked very good. But you can't look inside an engine... It looks good, it runs good...what should I say. On base of my knowledge today, it was a truck made of parts over one decade... AOD changed to C6...interior parts from a 90th truck...as you haven't the knowledge of the single models of the brands you'll buy, you can easily buy scrap without knowing it... But my body and chassis are nearly free of rust...only to day something positive... Link to comment Share on other sites More sharing options...
85lebaront2 Posted April 16, 2023 Share Posted April 16, 2023 No, the others seems to be OK. Maybe one lifter has another pattern...but also a circle. No lines on it. So this is identical to the lobes. Nothing you can see without measuring... I have to hone the bore of the defective lifter. It got scratches from removing the lifter... I have inspected also the inlets of the bores. No ridges...only at the one with the defective lifter. Also the cam bearings are ok. Nothing suspicious.... I have also tried to punch the defective lifter and a good one...without any difference.. What you are seeing is what I have been seeing from a number of different sources. Cams and lifters failing at very low hours, many never getting through the break-in run. If you still have the boxes the lifters came in, see if the country of origin is on there. If so, I will be willing to bet it says "China". One of the issues is most likely cost related, older lifters frequently had a cap on the bottom that was most likely an alloy steel that could be hardened and the cams were frequently nitrided for wear resistance. Much of the newer stuff that is failing, including roller lifters are showing metal flaking off which to me, from 30 years of working with this type of failure in a laboratory, says "case hardened" which is great, until something damages the very thin hardened layer. Underneath that layer, is very soft metal. Until recently, the only cam failures I used to see were Chevrolet V8s where one or more lobes would wipe out with no rhyme or reason. Link to comment Share on other sites More sharing options...
ReneH Posted April 17, 2023 Author Share Posted April 17, 2023 What you are seeing is what I have been seeing from a number of different sources. Cams and lifters failing at very low hours, many never getting through the break-in run. If you still have the boxes the lifters came in, see if the country of origin is on there. If so, I will be willing to bet it says "China". One of the issues is most likely cost related, older lifters frequently had a cap on the bottom that was most likely an alloy steel that could be hardened and the cams were frequently nitrided for wear resistance. Much of the newer stuff that is failing, including roller lifters are showing metal flaking off which to me, from 30 years of working with this type of failure in a laboratory, says "case hardened" which is great, until something damages the very thin hardened layer. Underneath that layer, is very soft metal. Until recently, the only cam failures I used to see were Chevrolet V8s where one or more lobes would wipe out with no rhyme or reason. So, good news today. Summit replaces the cam without any cost for me... Link to comment Share on other sites More sharing options...
Gary Lewis Posted April 17, 2023 Share Posted April 17, 2023 So, good news today. Summit replaces the cam without any cost for me... Wow!!!! Wonderful! Kudos to Summit. Link to comment Share on other sites More sharing options...
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