Most of the work on this is already done but considering how helpful this site and it's members have been to me, I thought it appropriate I bring you up to speed on what I've been up to.
Just a bit of background info - my 80s had 245K km on the clock when this project took off and current circumstances at the time made for less than ideal timing but, I guess there never really is a good time for expensive repairs. I've been wanting to yank the engine for some time now to rebuild it appropiately for a reliable turbo application and, as it turned out, the opportunity arose sooner rather than later. Here's the lead up to the engine getting yanked...
After not driving the old girl for several months, I decided to take it for a spin around the block yesterday arvo. All was going well until I pulled into a round-about and the engine lost a heap of power and was farting something fierce out the exhaust. I limped the few K's to home and checked under the oil filler cap only to find a fine film of milky residue. Nothing in the rad water or sump but I did a compression test today and I think it's confirmed my suspicions. Funny thing is I checked under the cap only a few days ago (force of habit) and it was all good. But, you get that sometimes. With the engine in neutral and at fast idle, the exhaust was sucking and blowing in quick succession which was a decent indication I also have exhaust valve issues.
Here's the results of the compression test. Spec as per Toyota FSM (DRY) - Max psi: 170.8, Min psi: 128
Allowable Variance psi: 14.2
Test Results (PSI)
CYL DRY WET Possible Issue
1 145 162 = well worn rings
2 145 162 = well worn rings
3 152 165 = well worn rings
4 112 130 = Head gasket
5 160 165 = Good
6 135 132 = Stuffed exhaust valve
While a compression test is only a guide to what is specifiaclly wrong, if nothing else I think it's clearly obvious I at least have a compression issue. And with the syptoms of a damaged exhaust valve, the best long term option is to yank the engine and give it a good going over.
Just a bit of background info - my 80s had 245K km on the clock when this project took off and current circumstances at the time made for less than ideal timing but, I guess there never really is a good time for expensive repairs. I've been wanting to yank the engine for some time now to rebuild it appropiately for a reliable turbo application and, as it turned out, the opportunity arose sooner rather than later. Here's the lead up to the engine getting yanked...
After not driving the old girl for several months, I decided to take it for a spin around the block yesterday arvo. All was going well until I pulled into a round-about and the engine lost a heap of power and was farting something fierce out the exhaust. I limped the few K's to home and checked under the oil filler cap only to find a fine film of milky residue. Nothing in the rad water or sump but I did a compression test today and I think it's confirmed my suspicions. Funny thing is I checked under the cap only a few days ago (force of habit) and it was all good. But, you get that sometimes. With the engine in neutral and at fast idle, the exhaust was sucking and blowing in quick succession which was a decent indication I also have exhaust valve issues.
Here's the results of the compression test. Spec as per Toyota FSM (DRY) - Max psi: 170.8, Min psi: 128
Allowable Variance psi: 14.2
Test Results (PSI)
CYL DRY WET Possible Issue
1 145 162 = well worn rings
2 145 162 = well worn rings
3 152 165 = well worn rings
4 112 130 = Head gasket
5 160 165 = Good
6 135 132 = Stuffed exhaust valve
While a compression test is only a guide to what is specifiaclly wrong, if nothing else I think it's clearly obvious I at least have a compression issue. And with the syptoms of a damaged exhaust valve, the best long term option is to yank the engine and give it a good going over.