Timing job has lead to other problems - Page 2 - Infamous Nissan

WetSocks · 07-21-2021, 04:55 PM

That's the plan. I'll be doing a leak down test at some point to determine if being out of time has bent any valves.

Would burnt coolant coming out the exhaust confirm bent valves? I have confirmed a bad seal given the chocolate milkshake of engine oil, how would coolant, heated by hot oil, escape the crank case? I'm thinking through a bent valve or the head gasket, but I don't think its the head gasket. Any other way it could be getting out of the crankcase?

alabama_lowlife · 07-22-2021, 10:10 AM

You could use a bore scope to look through the spark plug holes at the top of the pistons to see if there is any indication of contact with the valves.

WetSocks · 07-22-2021, 02:13 PM

Thanks, I may do that. If the pistons have been marred by valve strikes, would they need to be replaced? Does not seem like that would affect compression.

alabama_lowlife · 07-22-2021, 03:56 PM

My wife had a 97 that suddenly blew the head gasket. There were deep marks on all of the pistons. Who knows how long those had been there?

KivPanther · 07-23-2021, 09:47 PM

The pistons will have relief cuts in them from the factory so make sure you don’t mistake those for valve impact marks.

alabama_lowlife · 07-24-2021, 01:09 AM

I’m pretty sure the pistons don’t have relief cuts for the valves.

WetSocks · 07-26-2021, 08:11 PM

Any put RTV or other sealant on their valve cover bolts prior to installing?

Trying to think of every way to prevent coolant leaking into the crankcase.

alabama_lowlife · 07-26-2021, 10:50 PM

I’ve never used RTV on the bolts, just a thin smear on both sides of the gasket

Stinky · 07-27-2021, 03:02 PM

Alabama...what type do you use? Regular, Ultra, or High-Temp?

: )

alabama_lowlife · 07-27-2021, 04:39 PM

Whatever I have laying around. Just to hold the gasket in place during installation

07-22-2021, 10:10 AM	#12
alabama_lowlife Owner and Administrator Join Date: Sep 2008 Location: New Brockton, Alabama Age: 42 Posts: 10,887 Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2, 1994 Hardbody Thanks: 1,123 Thanked 2,266 Times in 1,863 Posts	You could use a bore scope to look through the spark plug holes at the top of the pistons to see if there is any indication of contact with the valves. __________________

07-22-2021, 03:56 PM	#14
alabama_lowlife Owner and Administrator Join Date: Sep 2008 Location: New Brockton, Alabama Age: 42 Posts: 10,887 Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2, 1994 Hardbody Thanks: 1,123 Thanked 2,266 Times in 1,863 Posts	My wife had a 97 that suddenly blew the head gasket. There were deep marks on all of the pistons. Who knows how long those had been there? __________________

07-23-2021, 09:47 PM	#15
KivPanther Furball Join Date: Oct 2020 Location: North Carolina Posts: 169 Vehicle: 1994 XE King Cab V6 Thanks: 4 Thanked 35 Times in 31 Posts	The pistons will have relief cuts in them from the factory so make sure you don’t mistake those for valve impact marks. __________________

07-24-2021, 01:09 AM	#16
alabama_lowlife Owner and Administrator Join Date: Sep 2008 Location: New Brockton, Alabama Age: 42 Posts: 10,887 Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2, 1994 Hardbody Thanks: 1,123 Thanked 2,266 Times in 1,863 Posts	I’m pretty sure the pistons don’t have relief cuts for the valves. __________________

07-26-2021, 10:50 PM	#18
alabama_lowlife Owner and Administrator Join Date: Sep 2008 Location: New Brockton, Alabama Age: 42 Posts: 10,887 Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2, 1994 Hardbody Thanks: 1,123 Thanked 2,266 Times in 1,863 Posts	I’ve never used RTV on the bolts, just a thin smear on both sides of the gasket __________________

07-21-2021, 04:55 PM	#11
WetSocks Join Date: Apr 2021 Location: NH Posts: 37 Vehicle: 1997 Hardbody 4x4 Thanks: 4 Thanked 2 Times in 2 Posts	That's the plan. I'll be doing a leak down test at some point to determine if being out of time has bent any valves. Would burnt coolant coming out the exhaust confirm bent valves? I have confirmed a bad seal given the chocolate milkshake of engine oil, how would coolant, heated by hot oil, escape the crank case? I'm thinking through a bent valve or the head gasket, but I don't think its the head gasket. Any other way it could be getting out of the crankcase?

07-22-2021, 02:13 PM	#13
WetSocks Join Date: Apr 2021 Location: NH Posts: 37 Vehicle: 1997 Hardbody 4x4 Thanks: 4 Thanked 2 Times in 2 Posts	Thanks, I may do that. If the pistons have been marred by valve strikes, would they need to be replaced? Does not seem like that would affect compression.

07-26-2021, 08:11 PM	#17
WetSocks Join Date: Apr 2021 Location: NH Posts: 37 Vehicle: 1997 Hardbody 4x4 Thanks: 4 Thanked 2 Times in 2 Posts	Any put RTV or other sealant on their valve cover bolts prior to installing? Trying to think of every way to prevent coolant leaking into the crankcase.

07-27-2021, 03:02 PM	#19
Stinky Join Date: Nov 2019 Location: Whitewater, CO Posts: 128 Vehicle: 86 2wd 720, 86 4x4D21 Thanks: 0 Thanked 12 Times in 12 Posts	Alabama...what type do you use? Regular, Ultra, or High-Temp? : )

07-27-2021, 04:39 PM	#20
alabama_lowlife Owner and Administrator Join Date: Sep 2008 Location: New Brockton, Alabama Age: 42 Posts: 10,887 Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2, 1994 Hardbody Thanks: 1,123 Thanked 2,266 Times in 1,863 Posts	Whatever I have laying around. Just to hold the gasket in place during installation __________________

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