Camshaft Removal Questions
I am trying to replace the camshaft seal on my 1991 Honda Civic LX. At this
point I am not seeing that I can literally pick it out, with, say, an awl, sharp screwdriver, and pliers. To do this right, the manuals say one must remove the camshaft. To get at the camshaft, the rocker arm and shaft assemblies must come out. After disconnecting the negative terminal of the battery and removing the valve cover, the next steps of the procedure state: "3. Loosen the adjusting screws two turns at a time, in a crisscross pattern, to prevent damaging the valves or rocker arm assembly." 4. Unscrew the camshaft holder bolts and remove the rocker arm and shaft assemblies. Leave the rocker arm bolts in place... " Are the "adjusting screws" in step 3 those that are adjusted to set valve lash (that is, the 16 screws with 10 mm hex socket fit locknuts)? If so, what does "crisscross" mean here? My Civic has four valves per cylinder, and so four screws (with locknuts) per cylinder. It also has 16 other bolts (12 mm hex socket fit), which I hope are instead the bolts for both steps 3. and 4. above, and for which I see a specific torque sequence for re-installation in the manual. |
Re: Camshaft Removal Questions
Caroline wrote:
<snip> > Are the "adjusting screws" in step 3 those that are adjusted to set valve lash > (that is, the 16 screws with 10 mm hex socket fit locknuts)? If so, what does > "crisscross" mean here? it means a loosening sequence of the rocker arm assembly, the bolts that hold the whole deal down, just like you'd use a patterned torquing sequence for head bolts. you use a criss-crossed opposites pattern to ensure the working surfaces of the rocker arms stay relatively square against each other and don't damage, or get damaged by, the camshaft. you should also loosen the valve lash adjusting screws, but you can get away without that most of the time. theoretically, it is possible to pull the seal without disassembly, but you need to sacrifice a screwdriver by grinding a hook into it and using it with a slide-hammer - tricky and liable to damage the sealing surface of the cam if you're not very careful. so, full disassembly is the "preferred" route even though you install the seal after the head is reassembled again. |
Re: Camshaft Removal Questions
Caroline wrote:
> > I am trying to replace the camshaft seal on my 1991 Honda Civic LX. At > this point I am not seeing that I can literally pick it out, with, say, > an awl, sharp screwdriver, and pliers. To do this right, the manuals say > one must remove the camshaft. To get at the camshaft, the rocker arm and > shaft assemblies must come out. After disconnecting the negative terminal > of the battery and removing the valve cover, the next steps of the > procedure state: [snip] Do NOT pull the camshaft just to replace the seal! The seal can usually be popped out by using a small straight blade screwdriver. Carefully slide the blade of the screwdriver under the lip of the seal next to the cam. Then carefully pry the seal out. The size of the screw driver that I usually use for this task is 7/32" wide x 0.032" thick with a length of 2 7/8" (Snap-On part # SDD20 though any similar size driver should work). Note that I use the same method for the front crank seal though these can be a little more troublesome as you've discovered. I like to avoid using a hook and slide hammer as it's much too easy to damage the outer seal journal. Good luck, Eric |
Re: Camshaft Removal Questions
"Eric" <say.no@spam.now> wrote
> Caroline wrote: > > > > I am trying to replace the camshaft seal on my 1991 Honda Civic LX. At > > this point I am not seeing that I can literally pick it out, with, say, > > an awl, sharp screwdriver, and pliers. To do this right, the manuals say > > one must remove the camshaft. To get at the camshaft, the rocker arm and > > shaft assemblies must come out. After disconnecting the negative terminal > > of the battery and removing the valve cover, the next steps of the > > procedure state: > > [snip] > > Do NOT pull the camshaft just to replace the seal! The seal can usually be > popped out by using a small straight blade screwdriver. Carefully slide the > blade of the screwdriver under the lip of the seal next to the cam. Then > carefully pry the seal out. The size of the screw driver that I usually use > for this task is 7/32" wide x 0.032" thick with a length of 2 7/8" (Snap-On > part # SDD20 though any similar size driver should work). Note that I use > the same method for the front crank seal though these can be a little more > troublesome as you've discovered. I like to avoid using a hook and slide > hammer as it's much too easy to damage the outer seal journal. > > Good luck, Eric Thanks Jim and Eric. I let all this sit over night, thought about Jim's hook suggestion as well as studied seal puller tools available commercially. I decided to try a can opener (the kind that comes on a scout knife) and a corkscrew (from my days removing packing from around valve stems, where a corkscrew-like tool worked great). Saw Eric's message this morning, thanked God ;-), and didn't touch any of the camshaft etc. screws or bolts. I had the camshaft seal off in less than 10 minutes with the cork screw. The crank seal came off within 20 minutes with the can opener. If I hadn't really mangled the crank seal yesterday, the corkscrew might have worked fine. Eric, the pop bottle material 2" x 3" (or so) sleeve, with oil on the inner lip of the seal and a thin coat of Ultra Grey Silicone on the outside circumference of the seal, worked great. I'm back on track and aiming to have everything back together by early this evening... |
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