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Cam belt install issues with loss of loss end power w/ Video
http://4g61t.org/forum/viewtopic.php?f=17&t=35629		 Page 1 of 1
Author:  bosco2023 [ Sat Nov 19, 2011 9:05 pm ]
Post subject:  Cam belt install issues with loss of loss end power w/ Video
Ok got the replacement head on last weekend and got everything buttoned up and noticed after a few minutes of idleing that the car had more of a lope than usual. I thought that the timing was off and figured i would take care of it later. Well the timing was at 10 degrees BTDC with the plug grounded on firewall. It ran fine but was a little lazy. I put the timing at 5 degrees BTDC and it runs about the same. Runs pretty good over 3500 rpms but is pretty lazy under that from idle to 3500. Care wants to idle down to the point where it gets on the 4-500 range at a stoplight despite me adjusting idle. nWhen I installed the timing belt, I put the arrow on the cam wheel so it was lined up with the arrow on the casting of head. I then install plastic lower cover after slipping belt onto upper and lower pulley to verify TDC with the combination of a screw driver in the #1 spark plug hole and arrow on lower pulley lined up with 0 degrees on lower pulley.. I rotated the whole assembly 5 times and every 2 rotations the crank and cam marks are dead on. Am I maybe 1 tooth off still on the cam pulley? Maybe one tooth retarded? Heres a shitty vid on a cold start up yesterday morning at 30 degrees outside. The idle is more choppy, pulls damn good over 3500-3800 and seems louder than usual. Btw, the car is straight pipe with cat only dumped in front of driver rear tire. When accellerating, it has the faint sound of a subaru boxter motor and alot more cackle while drifting in gear.

http://s35.photobucket.com/albums/d176/ ... =020-2.mp4
Author:  89Mirageman [ Sun Nov 20, 2011 9:09 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
The bottom timing mark is a roll pin on the sprocket I believe. It should line up with an arrow on the front case. Its been a while since I did a 1.5 belt but it sounds like its off a tooth to me.
Author:  bosco2023 [ Mon Nov 21, 2011 8:24 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
I wont be off till thurday so will pull lower cover then. Yesterday I pulled top cover and rolled over the engine several times and the arrows are dead on and the the groove cut in the lower pulley is dead on with the "T" on the timing marks on the plastic cover. I retimed the motor to 8 degrees BTDC and it seems to pull a little better, but still idles like it has a cam in it and its eating a liitle more gas then usual on my 90 miles round trip commute. Chris, I thought by using a phillips screw driver in the number 1 hole to verify would justify the makes on lower cover, but the crank does have a few degrees of rotation before the piston starts to sink again. I will have to look harder for the roll pin you are talking about. I took the lower cover on and of 5 times to verify the motor didnt turn while putting on the belt. What a pain in the ass this is, but atleast its running and I can drive it.
Author:  89Mirageman [ Tue Nov 22, 2011 8:46 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
Go to the parts store and borrow a compression gauge. Is this the head that you put together using spare parts? Its possible to have a slightly bent valve or one that isn't sealing correctly.
Author:  bosco2023 [ Thu Nov 24, 2011 9:47 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
Head seems to be fine. Have a comp gauge but may use it soon. Car is running as of now
Author:  Cuda-68 [ Fri Nov 25, 2011 2:36 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
From my recollection the roll pin is not the mark, just there to fool you. The mark is left of the roll pin by a few degrees.
Author:  bosco2023 [ Sun Nov 27, 2011 8:17 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
did a compression test today with the used head and got not so good results.. plugs look good and pulled better now but results were on a warm motor after getting home and letting it sit for 30 mins so I could handle plugs. Results were 110 125 180 125 will do test again in a week to see if seats are sealing better. i cranked each cylinder for 5 seconds each and then repeated. All plugs were out at time of test. I have not verified crank position yet. Wont be off till sunday.
Author:  89Mirageman [ Wed Nov 30, 2011 11:12 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
Quote:
From my recollection the roll pin is not the mark, just there to fool you. The mark is left of the roll pin by a few degrees.

I changed the t-belt on a 94 summit with the 12v 1.5 last night and the roll pin on the crank sprocket is the mark. There is an arrow on the front case at the 1-2 o'clock position. You line that up with the roll pin and the engine is at TDC. There is no other mark on that pulley.
Author:  Cuda-68 [ Thu Dec 01, 2011 3:47 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
Sorry for the confusion as the manual does say to line the dowel pin up.
Author:  89Mirageman [ Thu Dec 01, 2011 9:19 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
That mixed me up too when I first saw it. They show it like its a mark or dimple but the dowel pin is the only thing on that pulley. Kinda confusing really.
Author:  bosco2023 [ Thu Dec 01, 2011 9:03 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
What dowel pin are you referring ? You mean the flat spot on the crank end?
Author:  89Mirageman [ Thu Dec 01, 2011 11:52 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
If you look on the lower pulley you will see 4 threaded holes and one dowel pin. The dowel pin is the timing mark.
Author:  bosco2023 [ Fri Dec 02, 2011 9:08 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
Ok. Thought it was the groove cut into outer pulley edge
Author:  89Mirageman [ Fri Dec 02, 2011 10:43 am ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
Quote:
Ok. Thought it was the groove cut into outer pulley edge

That tells you that the engine is a TDC when that notch lines up with the T in the lower timing cover. The roll pin and the arrow on the front cover allows you to set it at TDC w/o putting the plastic cover back on.
Author:  bosco2023 [ Fri Dec 02, 2011 6:19 pm ]
Post subject:  Re: Cam belt install issues with loss of loss end power w/ V
I pulled that cover off several times, and if that is the case them timing is pretty much on. At the moment of top dead center, the lower pulley has several degrees of rotation before the piston starts to decent in the bore maybe it's the fact that 2 cylinders are down on psi and the lowest is 120's
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