All rockers broken
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From: Phoenix
All rockers broken
Hi I have a 07 lsj with 117k miles I was at a stop sign when I put it in first and it stalled I tried to start it and it just a made a starter noise, I had a friend push my car with his truck and a tire thinking I could let out the clutch and push start it, it back fired twice, I then towed it home took the valuable cover off thinking the timing chain broke cause the starter was turning everything, all the rockers were broken pins everywhere not one was in tact, the cans looked perfectly fine no scratches or indents, the timing chain was super tight, I ordered new rockers from zzp and I’m going to try to install them without removing the cams and do a compression test. I took off the oil pan and found three pins from the bearings in the rockers, no metal was in the oil but a plastic piece, there were some metal sparkles but I’m going to assume they are from the broken rockers, any one know why all the rockers broke and if it was the back fire what happened in the first place.
You can put an air chuck out of a compression tester in the spark plug holes and put some compressed air into the cylinder and see if it holds air somewhat or immediately blows out. That could be an initial check for bent valves before you remove the head.Make sure all rockers are out and also make sure your air chuck from compression tester your using to fill your cylinders doesn't have a schrader valve in it. Some do, in the screwed end where it goes into the plug hole. Found that out the hard way doing a cam swap once and dropped a valve. I was able to get it back in pulling my intake manifold and using thin wire looped thru a brake line, but seeing a valve drop when you think your cylinder is filled with air ranks right up there with me coming home from work early to a strange car in the driveway! Might try that first. And new timing chain kit while you are in there.
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From: Phoenix
Yeah my plan is too put the rockers in and turn the engine by hand to make sure nothing is hitting each other than I’m going to tap the key and if everything looks fine I’m going to do the compression test, I tried to do a compressed compression test but I don’t think my compressed was powerful enough and I’m not sure but air seemed to be coming out of cylinder 1 when I tested it out on 4 and there was no compression so I think I didn’t do soemthing right.
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Joined: 04-19-09
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From: Jackson, TN
I wouldn't spin anything over at this point. The rockers don't just come apart on their own. really need to pull the chain and cams and do a leakdown test. Inspect the chain guides for damage too.
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From: Phoenix
I tried to do the compression test with the compresser but I’m not sure if the machine was not working or if I really had 0 pressure. When I shot pressure it was leaking from somewhere quite a bit but it felt like it was coming from the spark plug cylinder that I was testing compression on. I was planning on putting each rocker in one by one turning the engine by hand at the point where the cam wasn’t pushing down on the rocker, I was able to fit a rocker that was still somewhat in tact, so once I get the rockers tomarrow I was planning on putting them in turning the engine by hand to make sure it wasn’t off timed and then doing a compression test by key, if it was off timing I might buy a new chain or just sell the car. I’m going to post pictures in a little bit.
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From: Phoenix
Yes that’s the tool I’m using I had the psi to 100 and when I plugged it in I made sure the cylinder was at tbc and leakage didn’t move at all stayed at 100% it felt and sounded like it was leaking from were the spark plug was were I screwed in the leak down test . Also when I tried cylinder 4 I had the spark plug out of 1 and when I held my hand over the spark plug hole the leaking sound went down.
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tycoonbob
2.0L LSJ Performance Tech
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Mar 29, 2019 03:57 PM