O-300 Camshaft replacement / Engine overhaul

[AK170Ragwing]

So.... During the pre buy on my airplane, we found some corrosion on the camshaft. I am looking for advice as far as where to look to find a camshaft to purchase as well as lifters. I'm assuming that I will have to do a total rebuild on this engine. Also looking for advice on engine shops that are trustworthy. I'm not exactly sure which way I should go here. The engine has about 1200 TT on it and everything looks good except one lobe on the cam has a little pitting. I'm sure the magnetos need rebuilt as well.

Thanks in advance!

Josh

[counsellj]

New lifters and cams can be purchased at Aircraft Specialties in OK. That is also where I sent my crankshaft to get turned when I overhauled my O-300. I am sure there are good shops in either Anchorage or Fairbanks for this that would be easier for you.

[AK170Ragwing]

Thanks for the recommendation CounsellJ! I bought the only reconditioned camshaft that Aircraft Specialties had. The lifters are 164 dollars each. Is it a must to replace all the lifters when you replace the camshaft? I figured it would be a good idea but I didn't buy them yet.

[counsellj]

I have a spare set of used lifters that I would sell if you are interested. Call me at 850-723-2072

[AK170Ragwing]

Thanks CounsellJ, I will give you a call this evening. I am also looking for the hard to find check valve for the fuel system that the part number was changed. I believe it is part number S4176-1. Any ideas where I can locate this check valve?

Josh

[Bruce Fenstermacher]

You DO NOT want to put used followers on a new/reground cam. Followers must be new or reground. The follower is was rides on the cam lobe. It contains a hydraulic unit which should also be certified. The follower and a hydraulic unit make up a lifter.

[GAHorn]

Thanks CounsellJ, I will give you a call this evening. I am also looking for the hard to find check valve for the fuel system that the part number was changed. I believe it is part number S4176-1. Any ideas where I can locate this check valve?

Josh

Check out this post: viewtopic.php?f=24&t=15412&p=143293&hil ... ve#p143293

PS: Many folks do not know that the check-valve originally has a spring inside it which should be removed before the valve is installed.

[AK170Ragwing]

You DO NOT want to put used followers on a new/reground cam. Followers must be new or reground. The follower is was rides on the cam lobe. It contains a hydraulic unit which should also be certified. The follower and a hydraulic unit make up a lifter.

Hello Bruce, I was planning on getting either a new set or having a used set reconditioned before I installed them in the new engine during the build. I'm still trying to decided if buying new would be worth the extra cost. I'm not sure if a reconditioned set would be the equivalent to a new set? I definitely don't want to have any issues that would force me to tear open the engine again before I need to.

[AK170Ragwing]

Thanks CounsellJ, I will give you a call this evening. I am also looking for the hard to find check valve for the fuel system that the part number was changed. I believe it is part number S4176-1. Any ideas where I can locate this check valve?

Josh

Check out this post: viewtopic.php?f=24&t=15412&p=143293&hil ... ve#p143293

PS: Many folks do not know that the check-valve originally has a spring inside it which should be removed before the valve is installed.

Hello GAHorn,

I found a check valve part number 10630 on Aircraft Spruce's website. I guess I can't use that check valve for the installation? If I have to use this Parker check valve it is considerably more money than the one on the Aircraft Spruce website but I just want to make sure that I have the correct check valve and don't install an incorrect part. I still have to buy the fuel pump as well. My engine doesn't have the fuel pump or check valve installed. I found out it was supposed to be there during my pre-buy research.

Does anybody have any pictures of this check valve and all other fitting installed on the airplane for reference purposes?

[GAHorn]

[

Hello GAHorn,

I found a check valve part number 10630 on Aircraft Spruce's website. I guess I can't use that check valve for the installation? If I have to use this Parker check valve it is considerably more money than the one on the Aircraft Spruce website but I just want to make sure that I have the correct check valve and don't install an incorrect part. I still have to buy the fuel pump as well. My engine doesn't have the fuel pump or check valve installed. I found out it was supposed to be there during my pre-buy research.

Does anybody have any pictures of this check valve and all other fitting installed on the airplane for reference purposes?

The check valve mentioned (10630) is not the one used by Cessna in your 170. If you read all the review of that valve at AircraftSpruce you will see it is not FAA approved, not TSO, not used in any certificated airplane. (It is likely offered by Spruce for the experimental market.)
Yes, I think I have pics of most of the system…but not in digital form I can post or email. The link I provided above to the part sold by Grainger is what the Cessna valve looks like. The IPC has a coarse illustraion on pg 62, Fig 34,but admittedly that’s not very helpful. I’m out of town at the moment but I’ll try to locate some pics I can copy/mail if you like when I get home.

Some Members, rather than deal with the original pump/check-valve/etc. convert their ‘48 “ragwing” 170s to the later 170A configuration under an approval by either FAA or a designated airworthiness or engineering representative. An upcoming 170 News article is soon expected to detail such a conversion one of our Members is currently undergoing.

[n2582d]

…
Does anybody have any pictures of this check valve and all other fitting installed on the airplane for reference purposes?

Josh, This thread has some pictures of ‘48 fuel system fittings.

[AK170Ragwing]

[

The check valve mentioned (10630) is not the one used by Cessna in your 170. If you read all the review of that valve at AircraftSpruce you will see it is not FAA approved, not TSO, not used in any certificated airplane. (It is likely offered by Spruce for the experimental market.)
Yes, I think I have pics of most of the system…but not in digital form I can post or email. The link I provided above to the part sold by Grainger is what the Cessna valve looks like. The IPC has a coarse illustraion on pg 62, Fig 34,but admittedly that’s not very helpful. I’m out of town at the moment but I’ll try to locate some pics I can copy/mail if you like when I get home.

Some Members, rather than deal with the original pump/check-valve/etc. convert their ‘48 “ragwing” 170s to the later 170A configuration under an approval by either FAA or a designated airworthiness or engineering representative. An upcoming 170 News article is soon expected to detail such a conversion one of our Members is currently undergoing.

Thanks GA Horn,

Hopefully I will be able to return the 10630 part number to Aircraft Spruce. I ordered a PARKER 453-1/4S2-6 Check Valve so that I can install the correct part. It says that the check valve is a "hydraulic check valve" but i'm sure its dual purpose. I look forward to reading the new 170 News article.