Author Topic: 1972 350 four, Resto attempt from ground zero (Read 23991 times)

mattcb350f · « **Reply #50 on:** November 18, 2008, 06:48:22 PM »

Make sure you have a way of keeping track of which piston is which (1-4, left to right). I had four ziploc bags labeled one to four, for each piston and kept all the bits (wrist pin, clips, rings, and piston) together in each bag.

This is important, because you want the pistons to go back in the right holes.

The shop should, or you might have to ask them, put markings on the pistons to tell them apart. this is usually small dimples, the number of which indicates the piston number.

One more thing, when pushing out the wrist pin to remove the piston from the connecting rod, try not to put too much side load on the connecting rod. Hold the other side of the piston when doing this.

If you press real hard one way to push the pin out, it is really hard on the bearings in the bottom end.

Matt.

Jim · « **Reply #51 on:** November 18, 2008, 07:10:58 PM »

Matt
I got them out without too much side pressure and have kept them separated. I'm a bit concerned for the retaining circular clips but hope they will be OK (are new replacements easy OEM?). getting them back in is going to be a treat.
Generally tho I should be good. I researched some posts regarding reassembly tips. I'll bring these parts to the machine shop tomorrow for relap/clean measure as you and Tim have suggested.

I"ll have to get gaskets tomorrow as well.

What is this?

Jim

Tim in Ohio · « **Reply #52 on:** November 18, 2008, 09:09:44 PM »

Looks a little different than mine, but I believe that is a "dowel" right Matt?
There is one on each side... they help line up the head with the block and oil flows thru them.

mattcb350f · « **Reply #53 on:** November 19, 2008, 05:00:25 AM »

That's an Oil Restrictor Valve. It works to ensure consistent oil pressure to the cylinder head, and also happens to be the location where most cylinder head gasket leaks start on the 350F engine

..Works as a Dowel too I suppose Tim,

Matt.

Jim · « **Reply #54 on:** November 19, 2008, 05:37:23 AM »

Ok to re-use Matt or is it a must to replace to assist in avoiding new leaks?
J

Jim · « **Reply #55 on:** November 19, 2008, 09:15:00 AM »

Please help or advise.
The machine shop just called to say that i have 2 bent exhaust valves. I can get new stem seals but Honda has discontinued the valves.

Please help;
Can someone suggest a solution?
Can someone supply 4 good (new or used) exhaust valves that i can have relaped? Is there an alternative?

Any help is appreciated; I don't know where to turn. Not a large cache of '72 350's where i am.
Jim

Tim in Ohio · « **Reply #56 on:** November 19, 2008, 09:45:00 AM »

Jim,
Check out the "Parts for Sale" section of this forum:
http://forums.sohc4.net/index.php?board=35.0

If you see someone parting out a CB350Four, even if they don't specifially list the parts you are seeking or even if it is not exactly your model year, I would still check with them.

Also:
http://www.westernhillshondayamaha.com/parts_01.asp

This place is great at getting NOS parts for vintage Hondas.

mattcb350f · « **Reply #57 on:** November 19, 2008, 09:54:11 AM »

PM sent Jim

Matt.

Jim · « **Reply #58 on:** November 19, 2008, 10:08:34 AM »

Thanks for the feedback. I check a few spots and heard from some folks... I've got sdome on the way from Western Hills in Ohio. (@$45 ea!)

Thanks again...
J

Jim · « **Reply #59 on:** November 19, 2008, 06:27:47 PM »

I just realised that i almost didn't tear down that engine. I would have pretty pissed to discover these valves bad after getting so close to the opportunity to repair them.
wow!
J

Jim · « **Reply #60 on:** November 23, 2008, 06:34:29 PM »

It would appear to me that this cam chain tensioner is broken on the bottom end and needs replacement. Is it?
J

mattcb350f · « **Reply #61 on:** November 23, 2008, 07:29:10 PM »

Nope. That rubber dealy is a seperate piece which is a damper/holder for the long tensioner.

It fits in a square cup on the 'U' shaped tensioner part under the crankshaft.

Although that tensioner looks fine in the pic, you want to look for wear on the face of it where the chain rubs. If there is a lot of wear there or chatter marks from a loose chain then it should be replaced. Otherwise it's good.

Matt.

Jim · « **Reply #62 on:** November 23, 2008, 08:05:04 PM »

That's where i found it... in the cup at the bottom. That's amazing, I would have thought it broken but knew one of you would know. Thanks very much.

The tensioner itself seems a bit worn of the face (2 long wear marks running the length) obviously from the chain contact. I think, as I'm not interested in going back here again, i will look for one to replace it regardless.

J

fastbroshi · « **Reply #63 on:** November 25, 2008, 07:16:48 AM »

Thanks for posting all the pics, don't get to see the insides of too many 350s.

Jim · « **Reply #64 on:** November 25, 2008, 06:29:04 PM »

I'm Looking at a few details while i wait for my exhaust valves to arrive. I thought i would flip the engine over, remove the oil pan - clean and inspect. This has motivated further questions:

350F%20four/350941.jpg[/IMG]

To begin with I belieeve it is safe to assume the black filings are fairly normal? or at least the condition of the screen is typical ... just clean and proceed?

Next;
These are little gems found within the much in the pan; Comments?

I wonder what this little black plastic part is? When i repositioned the engine right side up it appeared on the floor. Any idea where it came from? Is it another piece of the cam tension er? Is it recognised? I put it against the other piece i pulled out from that cup at the bottom of the tensions-er to show they are similar size and material but different shape.

Finally... Is the wear on these tensioners enough to require replacement? Can you tell?

Thanks folks.
J

Tim in Ohio · « **Reply #65 on:** November 25, 2008, 08:01:30 PM »

Jim,
That piece you found is a damper for the other end of the chain tensioner (one goes on both ends).
That screen needs a serious cleaning.
Tim

Jim · « **Reply #66 on:** November 25, 2008, 08:08:52 PM »

One at each end? The top is fitted with a metal heard and the bottom sat in the cup where i found the other ...

Is there a link to a pic somewhere? The clymer manual is not providing good detail. (you think those tensioners should be replaced? I wonder if the material on the screen came from the tensioners?

J

Tim in Ohio · « **Reply #67 on:** November 25, 2008, 09:37:12 PM »

Jim,
See drawing: Note TWO dampers.

I don't know about replacing that "slipper"... I wasn't too concerned with that on my build. If it looks like crap, maybe... otherwise... probably not a biggie.

mattcb350f · « **Reply #68 on:** November 26, 2008, 09:05:15 AM »

Jim, I'd replace those slippers........that's probably what you are finding in the sump screen

Also, the non-bendy slipper, the one on the forward side of the engine has these tabs at the top and bottom to hold it in place. If they haven't already, the plastic part of the tabs tend to break off leaving a short stubby piece of metal which will rattle a hole in your head.
....and leave you wondering what that rattle is after you get it going.

Western hills should have both of them. The tensioner in the 350F is really the weak link in the engine. If anything, I'd want to replace more parts there

Matt.

fastbroshi · « **Reply #69 on:** November 26, 2008, 09:48:39 AM »

If it's anything like the 550's chain tensioner make that sucker perfect before you put everything back together, ie replace the dampeners and slipper, tensioner blade, etc. Yours is toast btw.

Quote

To begin with I belieeve it is safe to assume the black filings are fairly normal? or at least the condition of the screen is typical ... just clean and proceed?

Not normal, but I think others have identified the filings. Clean and reinstall.

Jim · « **Reply #70 on:** November 26, 2008, 11:17:18 AM »

OK,
I'm good thanks... That pic of the parts is clear and I'll be able to probe a bit further to find what goes where on reassembly. I've cleaned the filings and will replace all aspects of the tensioners. Interestingly Matt upon very careful inspection of the front guide i found the metal "pin" missing... it turned out to be one of the elements i fished from the oil pan!

It's like a voyage of discovery in here.... thanks guys.
J

Jim · « **Reply #71 on:** December 05, 2008, 06:19:19 PM »

Guys,
My head is back from the shop; the valves relapped and 4 new exhaust valves... the bucket is honed.
I'm ready to install the pistons. I note in the manual that there should be an "arrow" indicating the front of the piston. Mine do niot have this indication. They have the word "IN". Can you tell me if that indicates the "intake side of the engine?
Anyone know or wish to speculate? (if you look at previous pics you will see they were very crusted up at dissasembly and it's hard to determine previous orientation)

any help is as always... the only way this thing is going back together.
J

Owned · « **Reply #72 on:** December 05, 2008, 06:30:03 PM »

From the Shop Manual: Install the piston with the arrow mark on the piston head toward the front (exhaust side) and "IN" mark toward the rear (intake side) of the engine.

Good Luck!

scunny · « **Reply #73 on:** December 05, 2008, 08:11:45 PM »

yep, IN is inlet, let the voyage of discovery continue

hope your having fun Jim, take your time and think about what would have happened if you hadn't just had a wee look

Jim · « **Reply #74 on:** December 05, 2008, 08:42:02 PM »

Yes Scunny, you recall that eh? I'm pleased to have continued now for certain. (It is interesting however that my Clymer manual does not indicate the latter statement regarding the "in" as advised by Owned) Regardless I have the pistons on now and i'm looking at the next few sequences.

I purchased a gasket kit from Western Hills and i may need help identifying some placements. I will post pics tomorrow if i get in a jamb but next is the rings and I have to figure out which goes where.

J

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Author Topic: 1972 350 four, Resto attempt from ground zero (Read 23991 times)